兼容低版本IE的JScript5.5实现

·localeCompare 方法

因为 IE 4 不具备错误处理语句，因此 Error 对象在 IE 4 上并不具备 IE 5 以上 Error 对象应具有的功能，因此它对于 IE 4 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); 
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