js數組方法擴展

/**
 * Created by Administrator on 2016/9/1.
 */
//數組去重
Array.prototype.unique = function(){
    this.sort();
    var re=[this[0]];
    for(var i = 1; i < this.length; i++){
        if( this[i] !== re[re.length-1]){
            re.push(this[i]);
        }
    }
    return re;
}

//擴展數組方法：查找指定元素的下標
Array.prototype.indexOf = function(val) {
    for (var i = 0; i < this.length; i++) {
        if (this[i] == val) return i;
    }
    return -1;
};

//擴展數組方法:刪除指定元素
Array.prototype.rmove = function(val) {
    var index = this.indexOf(val);
    while(index>-1){
        this.splice(index, 1);
        index = this.indexOf(val);
    }
    return this;
};