JS数组去重

array dedupe

Array.prototype.dedupe=function () {
    var hash={},result=[],
    hasown=Object.prototype.hasOwnProperty;
    for (var i = this.length - 1; i >= 0; i--) {
        if(!hasown.call(hash,this[i])){
            hash[this[i]]=1;
            result.push(this[i]);
        }
    };
    return result;
}