我正在尝试编写一个需要使用按钮更改背景的网站，但我无法...我创建了一个按钮，可以在单击按钮时更改背景颜色，但是在添加图像作为背景后，它不想更改背景颜色（显然）...<head><style>:root{ --main-bg: url(https://www.the url of my bg.jpg);}</style> // creating a variable for the bg of my site<style>body { background: var(--main-bg) repeat-x;}</style> // using this variable<script> var colors = ["#2d2d2d", "#f2f2f2"]; var colorIndex = 0; function changeColor() { var col = document.getElementById("body"); if( colorIndex >= colors.length ) { colorIndex = 0; } col.style.backgroundColor = colors[colorIndex]; colorIndex++;// the js script to change the bg color } </script><script> function backgroundHiding() { let root = document.documentElement; root.addEventListener("onclick", e => { if (--main-bg) = "#2d2d2d" { root.style.setProperty('--main-bg', " url(https://www.the urlof my bg.jpg)") } else { root.style.setProperty('--main-bg', "#2d2d2d") } // the js script to hide my img bg } </script><div class="button"> <body id='body'> <button onclick="changeColor(); backgroundHiding();" class="lightbutton"><span>Turn On/Off the lights</span> </button></div> // creating the button that interact with the two js functions</head>我预计它会起作用，但是......呃......不它有时有效，比如每 100 次 1 次，我不知道为什么......如果有人能帮助我，我会很感激！https://stackblitz.com/edit/typescript-ppvsvl?embed=1&file=index.html
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