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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数字</h1>
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<h2>toFixed() 方法</h2>
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<p>toFixed() 将数字转换为字符串，四舍五入到指定的小数位数：</p>
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<p id="demo"></p>
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<script>
let num = 5.56789;
let n = num.toFixed(10);
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document.getElementById("demo").innerHTML = n;
</script>
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</body>
</html>
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