love军

JS中的排它思想 
<!DOCTYPE html>
<html lang="en">
<head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>排它思想案例</title>
        <style>
            .color {
                color: white;
                background-color: red;
            }
            .skyblue {
                color: skyblue;
            }
        </style>
</head>
<body>
<button class="skyblue">你来点我</button>
<button class="skyblue">你来点我</button>
<button class="skyblue">你来点我</button>
<button class="skyblue">你来点我</button>
<button class="skyblue">你来点我</button>
<button class="skyblue">你来点我</button>
</body>
</html>

<script>
        // 实现点击切换类名样式
        let btnArr = document.getElementsByTagName('button');
        for (let i = 0; i < btnArr.length; i++) {
            btnArr[i].onclick = function (){
                //排他思想，点击的时候把所有的类名恢复初始样式，后再设置点击的新的样式
                for (let j=0;j<btnArr.length;j++){
                    btnArr[j].setAttribute('class','skyblue');
                }
                this.setAttribute('class','color');
            }
        }
</script>

 

posted on 2020-09-21 23:15  love军  阅读(253)  评论(0)    收藏  举报