javascript当中prototype用法
prototype
见上一节,马克-to-win:prototype作用就是给某个类增加一个实例方法。
马克- to-win:马克 java社区:防盗版实名手机尾号: 73203。
例 3.6.2
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
</head>
<script>
/*When the Global object is created, it always has at least the following properties:
Object object Function object Array object String object
Boolean object Number object Date object Math object
Value properties
*/
Array.prototype.mymethod = function(number)
{
var result = -1;
/*注意mymethod功能是找出某数在数组中出现的位置。作为Array的一个function,可以访问Array的属性this.length, 参见上一个prototype的例子,
Student.prototype.infop = function()/*此方法可以为所有Student对象所用*/
{
document.writeln("对象的qixy属性p:" + this.qixy);
document.writeln("对象的age属性p:" + this.age);
/*下列话是合法的, 因为不是this.number, 而是Student.number*/
document.writeln("static method is " + Student.number);
};
*/
for (var i = 0; i < this.length; i ++)
{
if (this[i] == number)
{
result = i;
break;
}
}
return result;
}
var a = [3,5,23,4,67];
document.writeln(a.mymethod(4));
var zhanwei = "zhanwei";
</script>
输出结果:
3