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寄生组合式继承.html
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寄生组合式继承.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>2.6 终极继承者----寄生组合式继承</title>
</head>
<body>
<script>
/*
* 寄生式继承依托于原型继承，原型继承又与类式继承想象。
* 即： 原型与构造函数的组合继承
* 寄生式继承 继承原型
* 传递参数 childClass 子类
* 传递参数 parentClass 父类
*/
function Student(obj) {
this.name = obj.name || 'Unnamed'
}
Student.prototype.hello = function () {
console.log('Hello, ' + this.name + '!');
}
//定义子类
function PrimaryStudent (props) {
// 调用Student构造函数，绑定this变量:
Student.call(this, props)
this.grade = props.grade || 1;
}
// 继承封装
function inherits(Child, Parent) {
var F = function () {};
F.prototype = Parent.prototype;
Child.prototype = new F();
console.log(Child.prototype.constructor, '测试修改之前的child构造函数')
Child.prototype.constructor = Child;
}
// 实现原型继承链
inherits(PrimaryStudent, Student)
// 绑定其他方法到PrimaryStudent原型
PrimaryStudent.prototype.getGrade = function () {
console.log(this.name + '分数：' + this.grade)
return this.grade;
}
// 创建xiaoming:
var xiaoming = new PrimaryStudent({
name: '小明',
grade: 2
})
xiaoming.hello()
xiaoming.getGrade()
var arr = [1,2,3];
for(var i=0,val; val = arr[i]; i++){
// 同理，三次后结束
console.log(i, '我啥时结束')
}
</script>
</body>
</html>