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fix-ie5.js擴(kuò)展在IE5下不能使用的幾個(gè)方法

更新時(shí)間：2007年08月20日 16:36:14 作者：

在IE5下的Javascript：
Array不支持push(),pop()；Function不支持apply()；String對(duì)象的replace方法不支持替換成一個(gè)處理函數(shù)。
使用下面的代碼就可修復(fù)上述方法在IE5下無(wú)效的問(wèn)題。
/*
  fix-ie5.js, version 1.0 (pre-release) (2005/05/15) x3
  Copyright 2005, Dean Edwards
  Web: http://dean.edwards.name/

  This software is licensed under the CC-GNU LGPL
  Web: http://creativecommons.org/licenses/LGPL/2.1/
*/

if (/MSIE 5.0/.test(navigator.userAgent)) new function() {

  var $$apply = function($function, $object, $arguments) {
    $function.apply($object, $arguments);
  };

  // fix String.replace
  if (''.replace(/^/, String)) {
    // preserve String.replace
    var _stringReplace = String.prototype.replace;
    // create String.replace for handling functions
    var _functionReplace = function($expression, $replacement) {
      var $match, $newString = "", $string = this;
      while ($string && ($match = $expression.exec($string))) {
        $newString += $string.slice(0, $match.index) + $$apply($replacement, this, $match);
        $string = $string.slice($match.lastIndex);
      }
      return $newString + $string;
    };
    // replace String.replace
    String.prototype.replace = function ($expression, $replacement) {
      this.replace = (typeof $replacement == "function") ? _functionReplace : _stringReplace;
      return this.replace($expression, $replacement);
    };
  }

  // fix Function.apply
  if (!Function.apply) {
    var APPLY = "apply-" + Number(new Date);
    $$apply = function(f, o, a) {
      var r;
      o[APPLY] = f;
      switch (a.length) { // deconstruct for speed
        case 0: r = o[APPLY](); break;
        case 1: r = o[APPLY](a[0]); break;
        case 2: r = o[APPLY](a[0], a[1]); break;
        case 3: r = o[APPLY](a[0], a[1], a[2]); break;
        case 4: r = o[APPLY](a[0], a[1], a[2], a[3]); break;
        default:
          var aa = [], i = a.length - 1;
          do aa[i] = "a[" + i + "]"; while (i--);
          eval("r=o[APPLY](" + aa + ")");
      }
      delete o[APPLY];
      return r;
    };
    // fix ICommon
    ICommon.valueOf.prototype.inherit = function() {
      return $$apply(arguments.callee.caller.ancestor, this, arguments);
    };
  }

  // array fixes
  if (![].push) Array.prototype.push = function() {
    for (var i = 0; i < arguments.length; i++) {
      this[this.length] = arguments[i];
    }
    return this.length;
  };
  if (![].pop) Array.prototype.pop = function() {
    var $item = this[this.length - 1];
    this.length--;
    return $item;
  };
};