原型 - 简书

原型
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
    </body>
    <script type="text/javascript">
        //原型通过构造函数的prototype属性进行添加
        //一般情况属性直接写到构造函数内部，消耗性能的方法使用原型追加
        function People (name,age) {
            this.name=name;
            this.age=age;
            this.say = function () {
                alert("hello");
            }
        }
        
        //原型追加 性别，吃饭，打豆豆
        
        People.prototype.sex = "男";
        People.prototype.chifan = function () {
            alert("chifan");
        }
        People.prototype.dadoudou = function () {
            alert("dadoudou");
        }
        var kk = new People("kk",15);
//      alert(kk.sex);
        
        var arr = [1,2,3,4]
        Array.prototype.kk = function () {
            var num=0;
            for(var i=0;i<this.length;i++){
                num+=this[i];
            }
            console.log(num);
        }
        arr.kk();
        
        String.prototype.trim=function () {
            var str=this.replace(/^\s+|\s+$/g,"");
            
            str = str.replace(/\s+/g," ");
            return "("+str+")";
        }
        var str="   #div1     span    ";
        console.log(str.trim());
        
        var ar=["星期日","星期一","星期二","星期三","星期四","星期五","星期六"]
        Date.prototype.getweek=function () {
            return ar[this.getDay()];
        }
        var date = new Date("2017/03/04");
        console.log(date.getweek());
    </script>
</html>
最后编辑于：2017.12.06 22:48:30
原型

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