<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>单例模式</title>
</head>
<body>
<script>
/* 模式的产生:在编码过程中 我们需要自定义一个类来不断new得到该对象的实例,
但是我们希望,new出来的实例都是同一个对象
*/
//es5的写法
var Person1 = (function () {
var _this = null;
return function (name,age) {
if(!_this){
_this = this;
}
_this.name = name;
_this.age = age;
return _this
}
})();
var person11 = new Person1("A",18);
console.log("姓名:"+person11.name,"年龄:"+person11.age);
var person22 = new Person1("B",19);
console.log("姓名:"+person22.name,"年龄:"+person22.age);
console.log(person11===person22); //==>true
//es6的写法
let Person = (function () {
let _this = null;
return class {
constructor(name,age) {
if (!_this) {
_this = this;
}
_this.name = name;
_this.age = age;
return _this;
}
}
})()
let person1 = new Person("A",18);
console.log("姓名:"+person1.name,"年龄:"+person1.age);
let person2 = new Person("B",19);
console.log("姓名:"+person2.name,"年龄:"+person2.age);
console.log(person1===person2); //==>true
</script>
</body>
</html>
js设计模式-单例模式
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转载自www.cnblogs.com/jsydb/p/9590068.html
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