44 lines
967 B
HTML
44 lines
967 B
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta http-equiv="X-UA-Compatible" content="IE=edge" />
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<meta name="viewport" content="width=device-width, initial-scale=1.0" />
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<title>Document</title>
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<style>
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.ball {
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width: 100px;
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height: 100px;
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border-radius: 50%;
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background-color: #f00;
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position: absolute;
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left: 0;
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top: 50px;
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animation: move 10s infinite alternate;
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}
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@keyframes move {
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0% {
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left: 0px;
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}
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100% {
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left: 500px;
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}
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}
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</style>
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</head>
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<body>
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<button id="btn">执行一段耗时的 JS 代码</button>
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<div class="ball"></div>
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<script>
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function delay(duration) {
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var start = Date.now();
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while (Date.now() - start < duration) {}
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}
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btn.onclick = function () {
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delay(5000);
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};
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</script>
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</body>
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</html>
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