javaScript 删除数组中指定元素

Array.prototype.indexOf = function(val) {
            for (var i = 0; i < this.length; i++) {
            if (this[i] == val) return i;
            }
            return -1;
},
Array.prototype.remove = function(val) {
        var index = this.indexOf(val);
        if (index > -1) {
        this.splice(index, 1);
        }
},

var arrayEmp = ["11","22" "33"];

arrayEmp.remove("11");