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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数学</h1>
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<p>Math.ceil() 将数字向上舍入到最接近的整数：</p>
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<p id="demo"></p>
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<script>
let a = Math.ceil(0.60);
let b = Math.ceil(0.40);
let c = Math.ceil(5);
let d = Math.ceil(5.1);
let e = Math.ceil(-5.1);
let f = Math.ceil(-5.9);
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document.getElementById("demo").innerHTML =
a + "<br>" + b + "<br>" + c + "<br>" + d + "<br>" + e + "<br>" + f;
</script>
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</body>
</html>
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