CSS display 属性：https://www.w3school.com.cn/cssref/pr_class_display.asp
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <style> #box { width: 100px; height: 100px; background-image: url('img/1.jpg'); background-repeat:no-repeat; background-size: cover; } .show { display: block; } .hidden { display: none; } </style> <script> window.onload = function () { var btn = document.getElementById('btn'); var box = document.getElementById('box'); isShow = true; btn.onclick = function () { if (isShow) { box.className = 'hidden'; btn.value = '显示'; isShow = false; } else { box.className = 'show'; btn.value = '隐藏'; isShow = true; } } } </script> </head> <body> <input type="button" value="隐藏" id="btn"><br> <div id="box"> </div> </body> </html>