53 lines
1.2 KiB
HTML
53 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 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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.main {
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width: 400px;
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height: 350px;
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margin: 30px auto;
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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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resize: none;
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}
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.main 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 name="" id="" cols="30" rows="10"></textarea>
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<span>300/300</span>
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</div>
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<script>
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var totalNums = 300;
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$("textarea").oninput = function () {
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var syLength = totalNums - $("textarea").value.length;
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if (syLength < 0) {
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$("textarea").value = $("textarea").value.substring(0,300)
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$("span").innerText = `300/0`
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} else {
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$("span").innerText = `300/${syLength}`
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}
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}
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function $(className) {
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return document.querySelector(className)
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}
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</script>
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</body>
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</html> |