js点击按钮切换盒子

xiaoxiao2021-02-28  21

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style type="text/css"> *{ padding: 0; margin: 0; } .cut{ margin: 100px auto; width: 300px; height: 300px; border: 1px solid; } .control button{ width: 60px; height: 30px; margin: 15px; } .show{ position: relative; } .show div{ margin-left: 30px; margin-top: 10px; width: 200px; height: 200px; position: absolute; display: none; background-color: deepskyblue; } #show1{ background-color: red; display: block; } #show2{ background-color: greenyellow; } #show3{ background-color: burlywood; } </style> </head> <body> <div class="cut"> <div class="control"> <button>切换1</button> <button>切换2</button> <button>切换3</button> </div> <div class="show"> <div id="show1"></div> <div id="show2"></div> <div id="show3"></div> </div> </div> </body> </html> <script type="text/javascript"> var btn = document.querySelectorAll('button'); var show = document.querySelectorAll('.show>div'); for (var i=0;i<btn.length;i++) { // 把当前按钮的下标保存,按下按钮对应显示下标一致的盒子,其它盒子隐藏 btn[i].index = i; btn[i].onclick = function(){ // 遍历每个按钮样式清空 // 遍历每个盒子隐藏 for (var j=0;j<btn.length;j++) { btn[j].className = '' show[j].style.display = 'none'; } // this表示当前按钮 this.className = 'active' // 盒子显示按钮下标的那个盒子,this。index是开始时保存的按钮下标 show[this.index].style.display = 'block' } } // 下面那种是简单明了,但是代码量多,以及电脑操作步骤多,会影响性能 // btn[0].onclick = function (){ // show[0].style.display = 'block'; // show[1].style.display = 'none'; // show[2].style.display = 'none'; // } // btn[1].onclick = function (){ // show[1].style.display = 'block'; // show[0].style.display = 'none'; // show[2].style.display = 'none'; // } // btn[2].onclick = function (){ // show[2].style.display = 'block'; // show[0].style.display = 'none'; // show[1].style.display = 'none'; // } </script>
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