parseInt(15.5); //15
Math.floor(15.5); //15
15.5 >>> 0; //15
15.5 >> 0; //15
15.5|0; //15
~~(15.5); //15
其实就是去掉小数点
JS向下取整
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转载自blog.csdn.net/Web_J/article/details/90381268
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