js通过指定下标或指定元素进行删除数组

删除指定下标数组元素Array.prototype.del=function(index){if(isNaN(index)||index>=this.length){return false;}for(var i=0,n=0;i<this.length;i++){if(this[i]!=this[index]){this[n++]=this[i];}}this.length-=1;};删除指定元素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);}};function a(){var arr = [1, 2, 3, 4, 5];alert(arr.toString());arr.remove(3);alert(arr.toString());}

第一种调用方式

arr.del(0);