lovecoding
/
web0331


			
				
					
						
						
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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>
    <style>
        #box1 {
            width: 200px;
            height: 200px;
            background: #f00;
        }
    </style>
</head>
<body>
    <div id="box1"></div>
    <script>
        var box1 = document.getElementById("box1");
        // 1.点击事件 this指向对象本身
        // box1.onclick = function() {
        //     console.log(this)
        // }
        // 2.定时器 指向全局window
        box1.onclick = function() {
            setInterval(function() {
                console.log(this)
            },1000)
        }
        // 3.对象中的this 指向对象本身
        var obj = {
            name:"Lucy",
            age:18,
            address:function() {
                console.log(this)
            }
        }
        obj.address()
        // 4.函数中this 指向window
        function fn1() {
            console.log(this,'函数')
        }
        fn1()
    </script>
</body>
</html>