javascript - 脚本438 : Object doesn't support property or method 'keys' for IE

Question

我发现以下代码很奇怪:

var allextRules = Ext.util.CSS.getRules();

Object.keys(allextRules).forEach(function(key) {
    var keyname = key;
    if(keyname.indexOf("js") != -1){
        Ext.util.CSS.removeStyleSheet(keyname);
        console.log(keyname + " Removed");
    }
});

当上述工作在其他浏览器(例如 Google Chrome)中测试时，没有错误。但是在IE 9中测试时，出现错误如下:

SCRIPT438: Object doesn't support property or method 'keys' 

根据本文 ( https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys )，IE 支持 Object.keys。

我是不是错过了什么？

Answer 1

尝试在您的代码之前添加此代码

    if (!Object.keys) {
  Object.keys = (function () {
    var hasOwnProperty = Object.prototype.hasOwnProperty,
        hasDontEnumBug = !({toString: null}).propertyIsEnumerable('toString'),
        dontEnums = [
          'toString',
          'toLocaleString',
          'valueOf',
          'hasOwnProperty',
          'isPrototypeOf',
          'propertyIsEnumerable',
          'constructor'
        ],
        dontEnumsLength = dontEnums.length;

    return function (obj) {
      if (typeof obj !== 'object' && typeof obj !== 'function' || obj === null) throw new TypeError('Object.keys called on non-object');

      var result = [];

      for (var prop in obj) {
        if (hasOwnProperty.call(obj, prop)) result.push(prop);
      }

      if (hasDontEnumBug) {
        for (var i=0; i < dontEnumsLength; i++) {
          if (hasOwnProperty.call(obj, dontEnums[i])) result.push(dontEnums[i]);
        }
      }
      return result;
    }
  })()
};

这里是有关此问题的更多详细信息 - https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/keys