Examples are as follows:

 Deletes the specified subscript array element
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;
  };
 Delete the specified element

    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());
    }

The first calling mode

arr.del(0);