55 lines
1.2 KiB
HTML
55 lines
1.2 KiB
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>留言</title>
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<style>
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body {
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margin: 0;
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padding: 0;
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}
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.main {
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width: 300px;
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height: 250px;
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margin: 20% auto;
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border:1px solid #000;
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position: relative;
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}
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textarea {
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width: 100%;
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height: 100%;
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}
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span {
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position: absolute;
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right: 10px;
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bottom: 10px;
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}
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</style>
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</head>
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<body>
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<div class="main">
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<textarea placeholder="请输入留言"></textarea>
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<span>0/50</span>
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</div>
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</body>
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<script>
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var textarea = document.querySelector("textarea");
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var span = document.querySelector("span");
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textarea.oninput = function () {
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var len = textarea.value.length;
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if (len > 50) {
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textarea.value = textarea.value.substring(0,50)
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} else {
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span.innerText = `${len}/50`;
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}
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}
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</script>
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</html> |