lovecoding
/
class


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // 单行注释
        /**
         * 多行注释
        */
        /**
         * 修改this指向:
         * call apply
         */
        function fn1(x,y) {
            var sum = x + y;
            console.log(sum);
            console.log(this);
            console.log(this.name);
        }
        var obj = {
            name: "Lucy"
        }
        // fn1(1,2);
        // xxx.call(指向哪就传哪，参数1，参数2...)
        fn1.call(obj,3,4)

        function fn2(x,y) {
            var sum = x * y;
            console.log(sum); // 6
            console.log(this); // window
            console.log(this.age); 
        }
        var obj2 = {
            name: "孙悟空",
            age: 20
        }
        // fn2(2,3)
        // xxx.apply(指向哪就传哪，[参数一，参数二...])
        fn2.apply(obj2,[4,5])

        function fn3(a,b) {
            var sum = b - a;
            console.log(sum); 
            console.log(this);
            console.log(this.name); 
        }

        var obj3 = {
            name: "猪八戒",
            age: 22
        }
        // fn3(6,7)
        // xxx.bind(指向哪就传哪，参数1，参数2)()
        fn3.bind(obj3,4,9)();
    </script>
</body>
</html>