lovecoding
/
VIP32


			
				
					
						
						
							1234567891011121314151617181920212223242526272829303132333435363738394041424344454647
							<!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>
        #box {
            width: 200px;
            height: 200px;
            background-color: aqua;
        }
    </style>
</head>
<body>
    <div class="btn">这是一个按钮</div>
    <div id="box"></div>
    <hr>
    <div id="list">
        <div class="a">今天</div>
        <div class="b">明天</div>
        <div class="c">后天</div>
    </div>
    <button>改变</button>
    <script>
        var btn = document.querySelector(".btn");
        // var btn = document.getElementById("btn");
        console.log(btn,'btn')
        var box = document.getElementById("box");
        btn.onclick = function(){
        console.log("点击");
            box.style.background = 'red';
        }
        var btn1 = document.querySelector("button");
        var a = document.querySelector(".a");
        var b = document.querySelector(".b");
        var c = document.querySelector(".c");
        btn1.onclick = function() {
            a.style.fontSize = '30px';
            a.style.color = 'red';
            b.style.fontWeight = '600';
            b.style.color = 'green';
            c.style.display = 'none';
        }
    </script>
</body>
</html>