<!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>
网友评论