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

问题

I found strange for the following code:

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");
    }
});

When the above work is tested in other browser (say - Google Chrome), there is no error. However, when tested in IE 9, there is error as follows:

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

According to this article (https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys), the Object.keys is supported by IE.

Have I miss out something?

回答1:

Try add this code before your

    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;
    }
  })()
};

here is more details about this issue - https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Object/keys

回答2:

in method 'forEach' (error script438: object doesn't support this property or method 'foreEach', in IE 9), the soluction was:

if (!Array.prototype.forEach) {
  Array.prototype.forEach = function(fun /*, thisp*/)
  {
    var len = this.length;
    if (typeof fun != "function")
      throw new TypeError();
    var thisp = arguments[1];
    for (var i = 0; i < len; i++)
    {
      if (i in this)
        fun.call(thisp, this[i], i, this);
    }
  };
}

Font: http://www.tutorialspoint.com/javascript/array_foreach.htm

来源：https://stackoverflow.com/questions/8306294/script438-object-doesnt-support-property-or-method-keys-for-ie

标签

javascript

extjs

internet-explorer-9