转换为数字的更快方法
将字符串转换为数字是极为常见的。最简单和快速的方法(jsPref)+
(加号) 来实现。
var one = '1';
var numberOne = +one; // Number 1
你也可以用-
(减号)将其转化为负数值。
var one = '1';
var negativeNumberOne = -one; // Number -1
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