JavaScript前端开发时数值运算的小技巧

1.格式化金钱值 const ThousandNum = num => num.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ","); const money = ThousandNum(20190214); // money => "20,190,214" 2.取整代替正数的Math.floor(),代替负数的Math.ceil() const num1 = ~~ 1.69; const num2 = 1.69 | 0; const num3 = 1.69 >> 0; // num1 num2 num3 => 1 1 1 3.转数值只对null