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您的位置：网站首页 > 网络编程 > JavaScript > javascript技巧

兼容低版本IE的JScript5.5实现

发布时间：2006-09-23　作者：　来源：转载

标签：雪佛兰通用奢华劳斯莱斯旗舰版 64位收藏夹解调器

作者Blog：www.coolcode.cnIE5.5中的JScript版本是5.5版，它比以前版本的JScript中多了如数组的push、pop、shift、unshift方法和encodeURI、decodeURI等一些重要的函数。而这些增加的内容在目前其他浏览器（如Moziila/Firefox和Opera）上也同样支持。因此目前

作者Blog：www.coolcode.cn

IE5.5中的JScript版本是5.5版，它比以前版本的JScript中多了如数组的push、pop、shift、unshift方法和encodeURI、decodeURI等一些重要的函数。而这些增加的内容在目前其他浏览器（如Moziila/Firefox和Opera）上也同样支持。因此目前开发网站一般对于IE浏览器只能兼容到5.5版，而对于更低版本的IE（如IE5、IE4等），则不再去考虑了。虽然这些低版本的IE浏览器目前已经不是主流，但如果能够不需要修改现有代码就能够兼容它们的话，倒是也可以考虑。因此我做了这个兼容低版本IE的JScript5.5实现。当然它不可能完全兼容JScript5.5，但对于最常用的一些方法，都已经实现了。

该库使用非常简单，只需要在网页的head部分加入：

就可以了。

完全实现的：

Array对象中：

·push方法
·pop方法
·shift方法
·unshift方法
·splice方法

Date对象中：

·toDateString方法
·toTimeString方法
·toLocaleDateString方法
·toLocaleTimeString方法
·Function对象中：
·apply方法
·call方法

Global对象中：

·undefined属性
·encodeURI方法
·encodeURIComponent方法
·decodeURI方法
·decodeURIComponent方法

Number对象中：

·toExponential方法
·toFixed方法
·toPrecision方法

对于错误处理，IE5（JScript5）中已经有了try…catch和throw语句，因此decodeURI、decodeURIComponent、toExponential、toFixed、toPrecision、apply如果出现运行期错误，在IE5上会抛出跟IE5.5+中一样的错误信息，但是因为IE4没有错误处理语句，如果上述函数出现运行期错误，将会返回null。注意上面说的运行期错误，不是指上述函数实现中的错误，而是指在这些函数正常工作的情况下应该出现的错误。

其中Function的apply函数的实现参考了：
http://www.openjsan.org/doc/a/ad/adamk/Upgrade/0.04/lib/Upgrade/Function/apply.html
这段程序。

不完全实现的：

Error对象

Object对象中：

·isPrototypeOf方法
·hasOwnProperty方法
·propertyIsEnumerable方法

String对象中：

·toLocaleLowerCase方法
·toLocaleUpperCase方法
·localeCompare方法

因为IE4不具备错误处理语句，因此Error对象在IE4上并不具备IE5以上Error对象应具有的功能，因此它对于IE4的实现只能保证你在访问或创建它时不会出错。

Object中的isPrototypeOf、hasOwnProperty和propertyIsEnumerable方法只是做了模拟实现，其返回值并非总是正确。

String对象中的toLocaleLowerCase、toLocaleUpperCase和localeCompare方法实际上并没有考虑本地字符集，但在大部分系统上它还是工作正常的。

完全没有实现的：

正则表达式对象中扩充的属性和限定符

下载: iecompat.js

/* iecompat.js 
* 
* Copyright Ma Bingyao  
* Version: 1.3 
* LastModified: 2006-06-18 
* This library is free.  You can redistribute it and/or modify it. 
* http://www.coolcode.cn/?p=126 
*/ 
  
/*@cc_on @*/ 
  
/*@if (@_jscript_version < 5) 
  
function Error(number, description) { 
    if (!number) this.number = 0; 
    else this.number = number; 
    if (!description) this.description = ""; 
    else this.description = description; 
} 
  
@end @*/ 
  
/*@if (@_jscript_version < 5.5) 
  
// this return value was not very correct 
Object.prototype.isPrototypeOf = function (o) { 
    return (this.constructor == o.constructor); 
} 
  
// this return value was not very correct 
Object.prototype.hasOwnProperty = function (proName) { 
    return (typeof(eval("this." + proName)) != "undefind"); 
} 
  
Object.prototype.propertyIsEnumerable = function (proName) { 
    for (var o in this) { 
        if ((proName == o.toString()) &&  
           (proName != "propertyIsEnumerable") &&  
           (proName != "isPrototypeOf") &&  
           (proName != "hasOwnProperty")) return true; 
    } 
    return false; 
} 
  
Error.prototype.message = ""; 
Error.prototype.name = "Error"; 
  
Date.prototype.toDateString = function () { 
    var s = this.toString().split(' '); 
    return [s[0], s[1], s[2], s[5]].join(' '); 
} 
  
Date.prototype.toTimeString = function () { 
    var s = this.toString().split(' '); 
    return [s[3], s[4]].join(' '); 
} 
  
Date.prototype.toLocaleDateString = function () { 
    return this.toLocaleString().split(' ')[0]; 
} 
  
Date.prototype.toLocaleTimeString = function () { 
    return this.toLocaleString().split(' ')[1]; 
} 
  
String.prototype.toLocaleLowerCase = function () { 
    return this.toLowerCase(); 
} 
  
String.prototype.toLocaleUpperCase = function () { 
    return this.toUpperCase(); 
} 
  
String.prototype.localeCompare = function (str) { 
    if (this > str) return 1; 
    if (this < str) return -1; 
    return 0; 
} 
  
Number.prototype.toExponential = function (n) { 
    function repeat(s, n) { 
        var out = ""; 
        for (var i = 0; i < n; i++) { 
            out += s; 
        } 
        return out; 
    } 
    if (!n) { 
        n = 0; 
    } 
    else { 
        n = parseInt(n); 
        if (n < 0 || n > 20) { 
            @if (@_jscript_version < 5) 
                return null; 
            @else 
                var e = new Error(-2146823262, "The number of fractional digits is out of range"); 
                e.name = "RangeError"; 
                e.message = e.description; 
                throw(e); 
            @end 
        } 
    } 
    var s, d, e, len; 
    s = this.toString().split("e"); 
    d = parseFloat(s[0]); 
    e = 0; 
    if (typeof(s[1]) != "undefined") { 
        e = parseInt(s[1]); 
    } 
    s = d.toString().split("."); 
    if (typeof(s[1]) != "undefined") { 
        e = e - s[1].length; 
        d = s[0] + s[1]; 
        d = d.replace(/^0+/g, ""); 
        if (d == "") d = "0"; 
    } 
    s = d.toString(); 
    len = s.length - 1; 
    e += len; 
    if (len < n) { 
        s += repeat("0", n - len); 
    } 
    else if (len > n) { 
        s = Math.round(parseFloat("." + s) * Math.pow(10, n + 1)).toString(); 
        if ((s.length - 1) > n) { 
            e += 1; 
            s = Math.round(parseFloat("." + s) * Math.pow(10, n + 1)).toString(); 
        } 
    } 
    if (e >= 0) { 
        e = "+" + e; 
    } 
    if (n == 0) { 
        return s + "e" + e; 
    } 
    else { 
        return s.substr(0, 1) + "." + s.substr(1) + "e" + e; 
    } 
} 
  
Number.prototype.toFixed = function (n) { 
    function repeat(s, n) { 
        var out = ""; 
        for (var i = 0; i < n; i++) { 
            out += s; 
        } 
        return out; 
    } 
    if (!n) { 
        n = 0; 
    } 
    else { 
        n = parseInt(n); 
        if (n < 0 || n > 20) { 
            @if (@_jscript_version < 5) 
                return null; 
            @else 
                var e = new Error(-2146823262, "The number of fractional digits is out of range"); 
                e.name = "RangeError"; 
                e.message = e.description; 
                throw(e); 
            @end 
        } 
    } 
    var s, d, e, len; 
    s = this.toString().split("e"); 
    d = parseFloat(s[0]); 
    e = 0; 
    if (typeof(s[1]) != "undefined") { 
        e = parseInt(s[1]); 
    } 
    s = d.toString().split("."); 
    if (typeof(s[1]) != "undefined") { 
        e = e - s[1].length; 
        d = s[0] + s[1]; 
        d = d.replace(/^0+/g, ""); 
        if (d == "") d = "0"; 
    } 
    s = d.toString(); 
    len = s.length - 1; 
     
    if (e >= 0) { 
        s += repeat("0", e); 
        if (n > 0) { 
            s += "." + repeat("0", n); 
        } 
    } 
    else if (-e <= n) { 
        s = repeat("0", 1 - e - s.length) + s; 
        s = s.substr(0, s.length + e) + "." + s.substr(s.length + e) + repeat("0", n + e); 
    } 
    else { 
        s = repeat("0", 1 - e - s.length) + s; 
        d = parseFloat(s.substr(0, s.length + e) + "." + s.substr(s.length + e)); 
        s = Math.round(d * Math.pow(10, n)).toString(); 
        if (n > 0) { 
            s = repeat("0", n - s.length + 1) + s; 
            s = s.substr(0, s.length - n) + "." + s.substr(s.length - n); 
        } 
    } 
    return s; 
} 
  
Number.prototype.toPrecision = function (n) { 
    function repeat(s, n) { 
        var out = ""; 
        for (var i = 0; i < n; i++) { 
            out += s; 
        } 
        return out; 
    } 
    if (typeof(n) == "undefined") { 
        return this.toString(); 
    } 
    else { 
        n = parseInt(n); 
        if (n < 1 || n > 21) { 
            @if (@_jscript_version < 5) 
                return null; 
            @else 
                var e = new Error(-2146823262, "The precision is out of range"); 
                e.name = "RangeError"; 
                e.message = e.description; 
                throw(e); 
            @end 
        } 
    } 
    if (this.valueOf() == 0) { 
        if (n == 1) return "0"; 
        return "0." + repeat("0", n - 1); 
    } 
    var s, d, e, len; 
    s = this.toString().split("e"); 
    d = parseFloat(s[0]); 
    e = 0; 
    if (typeof(s[1]) != "undefined") { 
        e = parseInt(s[1]); 
    } 
    s = d.toString().split("."); 
    if (typeof(s[1]) != "undefined") { 
        e = e - s[1].length; 
        d = s[0] + s[1]; 
        d = d.replace(/^0+/g, ""); 
        if (d == "") d = "0"; 
    } 
    s = d.toString(); 
    len = s.length; 
    d = parseFloat("." + s) * Math.pow(10, n); 
    s = Math.round(d).toString(); 
    if (s.length > parseInt(d).toString().length) { 
        e++; 
        s = s.slice(0, -1); 
    } 
    e += len - s.length; 
    len = s.length; 
    e += len - 1; 
  
    if (e < n && e > -7) { 
        if ((e < n - 1) && (e > 0)) { 
            s = s.substr(0, e + 1) + "." + s.substr(e + 1); 
        } 
        else if (e <= 0) { 
            s = repeat("0", - e) + s; 
            s = s.substr(0, 1) + "." + s.substr(1); 
        } 
    } 
    else { 
        if (len < n) { 
            s += repeat("0", n - len); 
        } 
        if (e >= 0) { 
            e = "+" + e; 
        } 
        if (n == 1) { 
            s += "e" + e; 
        } 
        else { 
            s = s.substr(0, 1) + "." + s.substr(1) + "e" + e; 
        } 
    } 
    return s; 
} 
  
var undefined; 
  
function encodeURI(str) { 
    var l = ['%00', '%01', '%02', '%03', '%04', '%05', '%06', 
             '%07', '%08', '%09', '%0A', '%0B', '%0C', '%0D', 
             '%0E', '%0F', '%10', '%11', '%12', '%13', '%14', 
             '%15', '%16', '%17', '%18', '%19', '%1A', '%1B', 
             '%1C', '%1D', '%1E', '%1F', '%20', '!', '%22', 
             '#', '$', '%25', '&', "'", '(', ')', '*', '+', ',', 
             '-', '.', '/', '0', '1', '2', '3', '4', '5', '6', 
             '7', '8', '9', ':', ';', '%3C', '=', '%3E', '?', 
             '@', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 
             'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 
             'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '%5B', '%5C', 
             '%5D', '%5E', '_', '%60', 'a', 'b', 'c', 'd', 'e', 
             'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 
             'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 
             'z', '%7B', '%7C', '%7D', '~', '%7F']; 
    var out, i, j, len, c, c2; 
  
    out = []; 
    len = str.length; 
    for (i = 0, j = 0; i < len; i++) { 
        c = str.charCodeAt(i); 
        if (c <= 0x007F) { 
            out[j++] = l[c]; 
            continue; 
        } 
        else if (c <= 0x7FF) { 
            out[j++] = '%' + (0xC0 | ((c >>  6) & 0x1F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 | (        c & 0x3F)).toString(16).toUpperCase(); 
            continue; 
        } 
        else if (c < 0xD800 || c > 0xDFFF) { 
            out[j++] = '%' + (0xE0 | ((c >> 12) & 0x0F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 | ((c >>  6) & 0x3F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 |         (c & 0x3F)).toString(16).toUpperCase(); 
            continue; 
        } 
        else { 
            if (++i < len) { 
                c2 = str.charCodeAt(i); 
                if (c <= 0xDBFF && 0xDC00 <= c2 && c2 <= 0xDFFF) { 
                    c = ((c & 0x03FF) << 10 | (c2 & 0x03FF)) + 0x010000; 
                    if (0x010000 <= c && c <= 0x10FFFF) { 
                        out[j++] = '%' + (0xF0 | ((c >>> 18) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 | ((c >>> 12) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 | ((c >>>  6) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 |          (c & 0x3F)).toString(16).toUpperCase(); 
                        continue; 
                    } 
                } 
            } 
        } 
        @if (@_jscript_version < 5) 
            return null; 
        @else 
            var e = new Error(-2146823264, "The URI to be encoded contains an invalid character"); 
            e.name = "URIError"; 
            e.message = e.description; 
            throw(e); 
        @end 
    } 
    return out.join(''); 
} 
  
function encodeURIComponent(str) { 
    var l = ['%00', '%01', '%02', '%03', '%04', '%05', '%06', 
             '%07', '%08', '%09', '%0A', '%0B', '%0C', '%0D', 
             '%0E', '%0F', '%10', '%11', '%12', '%13', '%14', 
             '%15', '%16', '%17', '%18', '%19', '%1A', '%1B', 
             '%1C', '%1D', '%1E', '%1F', '%20', '!', '%22', 
             '%23', '%24', '%25', '%26', "'", '(', ')', '*', '%2B', '%2C', 
             '-', '.', '%2F', '0', '1', '2', '3', '4', '5', '6', 
             '7', '8', '9', '%3A', '%3B', '%3C', '%3D', '%3E', '%3F', 
             '%40', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 
             'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 
             'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '%5B', '%5C', 
             '%5D', '%5E', '_', '%60', 'a', 'b', 'c', 'd', 'e', 
             'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 
             'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 
             'z', '%7B', '%7C', '%7D', '~', '%7F']; 
    var out, i, j, len, c; 
  
    out = []; 
    len = str.length; 
    for(i = 0, j = 0; i < len; i++) { 
        c = str.charCodeAt(i); 
        if (c <= 0x007F) { 
            out[j++] = l[c]; 
            continue; 
        } 
        else if (c <= 0x7FF) { 
            out[j++] = '%' + (0xC0 | ((c >>  6) & 0x1F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 | (        c & 0x3F)).toString(16).toUpperCase(); 
            continue; 
        } 
        else if (c < 0xD800 || c > 0xDFFF) { 
            out[j++] = '%' + (0xE0 | ((c >> 12) & 0x0F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 | ((c >>  6) & 0x3F)).toString(16).toUpperCase(); 
            out[j++] = '%' + (0x80 |         (c & 0x3F)).toString(16).toUpperCase(); 
            continue; 
        } 
        else { 
            if (++i < len) { 
                c2 = str.charCodeAt(i); 
                if (c <= 0xDBFF && 0xDC00 <= c2 && c2 <= 0xDFFF) { 
                    c = ((c & 0x03FF) << 10 | (c2 & 0x03FF)) + 0x010000; 
                    if (0x010000 <= c && c <= 0x10FFFF) { 
                        out[j++] = '%' + (0xF0 | ((c >>> 18) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 | ((c >>> 12) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 | ((c >>>  6) & 0x3F)).toString(16).toUpperCase(); 
                        out[j++] = '%' + (0x80 |          (c & 0x3F)).toString(16).toUpperCase(); 
                        continue; 
                    } 
                } 
            } 
        } 
        @if (@_jscript_version < 5) 
            return null; 
        @else 
            var e = new Error(-2146823264, "The URI to be encoded contains an invalid character"); 
            e.name = "URIError"; 
            e.message = e.description; 
            throw(e); 
        @end 
    } 
    return out.join(''); 
} 
  
function decodeURI(str) { 
    function throwerror() { 
        @if (@_jscript_version < 5) 
            return null; 
        @else 
            var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding"); 
            e.name = "URIError"; 
            e.message = e.description; 
            throw(e); 
        @end 
    } 
    function checkcode() { 
        var d1, d2; 
        d1 = str.charAt(i++); 
        d2 = str.charAt(i++); 
        if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) { 
            return throwerror(); 
        } 
        return parseInt(d1 + d2, 16); 
    } 
    function checkutf8() { 
        var c = str.charCodeAt(i++); 
        if (c == 37) { 
            if ((c = checkcode()) == null) return null; 
        } 
        if ((c >> 6) != 2) { 
            return throwerror(); 
        } 
    } 
    var out, i, j, len; 
    var c, c2, c3, c4, s; 
  
    out = []; 
    len = str.length; 
    i = j = 0; 
    while(i < len) { 
        c = str.charCodeAt(i++); 
        if (c == 37) { 
            if ((c = checkcode()) == null) return null; 
        } 
        else { 
            out[j++] = String.fromCharCode(c); 
            continue; 
        } 
        switch(c) { 
            case 35: case 36: case 38: case 43: case 44: case 47: 
            case 58: case 59: case 61: case 63: case 64: { 
                if (str.charCodeAt(i - 3) == 37) { 
                    out[j++] = str.substr(i - 3, 3); 
                } 
                else { 
                    out[j++] = str.substr(i - 1, 1); 
                } 
                break; 
            } 
            default: { 
                switch (c >> 4) {  
                    case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: { 
                        // 0xxxxxxx 
                        out[j++] = String.fromCharCode(c); 
                        break; 
                    } 
                    case 12: case 13: { 
                        // 110x xxxx   10xx xxxx 
                        if ((c2 = checkutf8()) == null) return null; 
                        out[j++] = String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F)); 
                        break; 
                    } 
                    case 14: { 
                        // 1110 xxxx  10xx xxxx  10xx xxxx 
                        if ((c2 = checkutf8()) == null) return null; 
                        if ((c3 = checkutf8()) == null) return null; 
                        out[j++] = String.fromCharCode(((c & 0x0F) << 12) | 
                            ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); 
                        break; 
                    } 
                    default: { 
                        switch (c & 0xf) { 
                            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: { 
                                // 1111 0xxx  10xx xxxx  10xx xxxx  10xx xxxx 
                                if ((c2 = checkutf8()) == null) return null; 
                                if ((c3 = checkutf8()) == null) return null; 
                                if ((c4 = checkutf8()) == null) return null; 
                                s = ((c  & 0x07) << 18) | 
                                    ((c2 & 0x3f) << 12) | 
                                    ((c3 & 0x3f) <<  6) | 
                                    (c4 & 0x3f) - 0x10000; 
                                if (0 <= s && s <= 0xfffff) { 
                                    out[j++] = String.fromCharCode(((s >>> 10) & 0x03ff) | 0xd800, 
                                                                    (s         & 0x03ff) | 0xdc00); 
                                } 
                                else { 
                                    return throwerror(); 
                                } 
                                break; 
                            } 
                            default: { 
                                return throwerror(); 
                            } 
                        } 
                    } 
                } 
            } 
        } 
    } 
    return out.join(''); 
} 
  
function decodeURIComponent(str) { 
    function throwerror() { 
        @if (@_jscript_version < 5) 
            return null; 
        @else 
            var e = new Error(-2146823263, "The URI to be decoded is not a valid encoding"); 
            e.name = "URIError"; 
            e.message = e.description; 
            throw(e); 
        @end 
    } 
    function checkcode() { 
        var d1, d2; 
        d1 = str.charAt(i++); 
        d2 = str.charAt(i++); 
        if (isNaN(parseInt(d1, 16)) || isNaN(parseInt(d2, 16))) { 
            return throwerror(); 
        } 
        return parseInt(d1 + d2, 16); 
    } 
    function checkutf8() { 
        var c = str.charCodeAt(i++); 
        if (c == 37) { 
            if ((c = checkcode()) == null) return null; 
        } 
        if ((c >> 6) != 2) { 
            return throwerror(); 
        } 
    } 
    var out, i, j, len; 
    var c, c2, c3, c4, s; 
  
    out = []; 
    len = str.length; 
    i = j = 0; 
    while(i < len) { 
        c = str.charCodeAt(i++); 
        if (c == 37) { 
            if ((c = checkcode()) == null) return null; 
        } 
        else { 
            out[j++] = String.fromCharCode(c); 
            continue; 
        } 
        switch(c >> 4) {  
            case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: { 
                // 0xxxxxxx 
                out[j++] = String.fromCharCode(c); 
                break; 
            } 
            case 12: case 13: { 
                // 110x xxxx   10xx xxxx 
                if ((c2 = checkutf8()) == null) return null; 
                out[j++] = String.fromCharCode(((c & 0x1F) << 6) | (c2 & 0x3F)); 
                break; 
            } 
            case 14: { 
                // 1110 xxxx  10xx xxxx  10xx xxxx 
                if ((c2 = checkutf8()) == null) return null; 
                if ((c3 = checkutf8()) == null) return null; 
                out[j++] = String.fromCharCode(((c & 0x0F) << 12) | 
                    ((char2 & 0x3F) << 6) | ((char3 & 0x3F) << 0)); 
                break; 
            } 
            default: { 
                switch (c & 0xf) { 
                    case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7: { 
                        // 1111 0xxx  10xx xxxx  10xx xxxx  10xx xxxx 
                        if ((c2 = checkutf8()) == null) return null; 
                        if ((c3 = checkutf8()) == null) return null; 
                        if ((c4 = checkutf8()) == null) return null; 
                        s = ((c  & 0x07) << 18) | 
                            ((c2 & 0x3f) << 12) | 
                            ((c3 & 0x3f) <<  6) | 
                            (c4 & 0x3f) - 0x10000; 
                        if (0 <= s && s <= 0xfffff) { 
                            out[j++] = String.fromCharCode(((s >>> 10) & 0x03ff) | 0xd800, 
                                                            (s         & 0x03ff) | 0xdc00); 
                        } 
                        else { 
                            return throwerror(); 
                        } 
                        break; 
                    } 
                    default: { 
                        return throwerror(); 
                    } 
                } 
            } 
        } 
    } 
    return out.join(''); 
} 
  
Array.prototype.push = function () { 
    var curlen = this.length; 
    for (var i = 0; i < arguments.length; i++) { 
        this[curlen + i] = arguments[i]; 
    } 
    return this.length; 
} 
  
Array.prototype.pop = function () { 
    var returnValue = this[this.length - 1]; 
    this.length--; 
    return returnValue; 
} 
  
Array.prototype.shift = function () { 
    var returnValue = this[0]; 
    for (var i = 1; i < this.length; i++) { 
        this[i - 1] = this[i]; 
    } 
    this.length--; 
    return returnValue; 
} 
  
Array.prototype.unshift = function () { 
    var curlen = this.length; 
    var arglen = arguments.length; 
    for (var i = curlen - 1; i >= 0 ; i--) { 
        this[i + arglen] = this[i] ; 
    } 
    for (var i = 0; i < arglen; i++) { 
        this[i] = arguments[i]; 
    } 
    //return this.length;  // return this value is Gecko/Opera implementation. but IE don't return anything. 
} 
  
Array.prototype.splice = function () { 
    var start = arguments[0]; 
    var deleteCount = arguments[1]; 
    var len = arguments.length - 2; 
    var returnValue = this.slice(start); 
    for (var i = 0; i < len; i++) { 
        this[start + i] = arguments[i + 2]; 
    } 
    for (var i = 0; i < returnValue.length - deleteCount; i++) { 
        this[start + len + i] = returnValue[deleteCount + i]; 
    } 
    this.length = start + len + returnValue.length - deleteCount; 
    returnValue.length = deleteCount; 
    return returnValue; 
} 
  
Function.prototype.apply = function (o, p) { 
    var ps = []; 
    if (typeof(o) == "undefined") { 
        var __$$apply$$__ = this; 
        return eval('__$$apply$$__(' + ps.join(', ') + ');'); 
    } 
    if (p) { 
        if (typeof(p[0]) == "undefined") { 
            @if (@_jscript_version < 5) 
                return null; 
            @else 
                var e = new Error(-2146823260, "Array or arguments object expected"); 
                e.name = "TypeError"; 
                e.message = e.description; 
                throw(e); 
            @end 
        } 
        for (var i = 0; i < p.length; i++) { 
            ps[i] = 'p[' + i + ']'; 
        } 
    } 
    if ((typeof(o) == "object") || (typeof(o) == "function")) { 
        o.__$$apply$$__ = this; 
        var returnValue = eval('o.__$$apply$$__(' + ps.join(', ') + ');'); 
        o.__$$apply$$__ = null; 
        return returnValue; 
    } 
    else { 
        this.__$$apply$$__ = this; 
        var returnValue = eval('this.__$$apply$$__(' + ps.join(', ') + ');'); 
        this.__$$apply$$__ = null; 
        return returnValue; 
    } 
} 
  
Function.prototype.call = function (o) { 
    var ps = []; 
    if (typeof(o) == "undefined") { 
        var __$$call$$__ = this; 
        return eval('__$$call$$__(' + ps.join(', ') + ');'); 
    } 
    if (arguments.length > 1) { 
        for (var i = 1; i < arguments.length; i++) { 
            ps[i - 1] = 'arguments[' + i + ']'; 
        } 
    } 
    if ((typeof(o) == "object") || (typeof(o) == "function")) { 
        o.__$$call$$__ = this; 
        var returnValue = eval('o.__$$call$$__(' + ps.join(', ') + ');'); 
        o.__$$call$$__ = null; 
        return returnValue; 
    } 
    else { 
        this.__$$call$$__ = this; 
        var returnValue = eval('this.__$$call$$__(' + ps.join(', ') + ');'); 
        this.__$$call$$__ = null; 
        return returnValue; 
    } 
} 
  
@end @*/

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]
如果你想测试低版本的 IE 浏览器上的效果，又没有安装低版本的 IE 浏览器，可以使用这个包：ie_all.zip。这里面都是不需要安装的 IE，直接释放压缩包到一个目录下，就可以运行了。如果你是 win9x 系统，可以到这里下载 win9x 版的 standalone IE。

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