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js的技巧 - 木易杨@ - SegmentFault 思否
source link: https://segmentfault.com/a/1190000020893439
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Number.isFinite(12); // true; 其他类型都为falseMath.trunc方法用于去除一个数(正负都可以)的小数部分，返回整数部分。console.log(Math.trunc(3.1));// 兼容性写法// Math.trunc = Math.trunc || function(x) {// return x < 0 ? Math.ceil(x) : Math.floor(x);// };
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