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lushijie/~~.js

Created May 19, 2017 04:00
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去除小数点
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~~.js
// ~符号用在JavaScript中有按位取反的作用，~~即是取反两次，而位运算的操作值要求是整数，其结果也是整数，所以经过位运算的都会自动变成整数，可以巧妙的去掉小数部分，类似于parseInt，比如：
let a = 1.23;
let b = -1.23;
console.log(~~a); // 1
console.log(~~b); // -1
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