[轉]IE8相容Object.keys

轉自：http://blog.sina.com.cn/s/blog_6d63cf160102vbsg.html

只需要加入

var DONT_ENUM =  "propertyIsEnumerable,isPrototypeOf,hasOwnProperty,toLocaleString,toString,valueOf,constructor".split(","),
    hasOwn = ({}).hasOwnProperty;
    for (var i in {
        toString: 1
    }){
        DONT_ENUM = false;
    }


    Object.keys = Object.keys || function(obj){//ecma262v5 15.2.3.14
            var result = [];
            for(var key in obj ) if(hasOwn.call(obj,key)){
                result.push(key) ;
            }
            if(DONT_ENUM && obj){
                for(var i = 0 ;key = DONT_ENUM[i++]; ){
                    if(hasOwn.call(obj,key)){
                        result.push(key);
                    }
                }
            }
            return result;
        };