lovecoding
/
W250913


			
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    <title>Document</title>
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<body>
    <a href="https://www.runoob.com/jsref/jsref-obj-math.html">Math对象</a>
    <script>
        var num = 1.167;
        var num2 = -1.167;
        // 向上取整 只要小数部分有值 就进行进位
        console.log(Math.ceil(num));
        // 向下取整 直接去掉小数部分
        console.log(Math.floor(num));

        // trunc 将数字的小数部分去掉，只保留整数部分。
        console.log(Math.trunc(num));

        console.log(Math.floor(num2));
        console.log(Math.trunc(num2));
        
        
    </script>
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