JavaScript常用记录
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Description
```javaScript
// 强制转换为Boolean 用 !!
var bool = !!"c";
console.log(typeof bool); // boolean
// 强制转换为Number 用 +
var num = +"1234";
console.log(typeof num); // number
// 强制转换为String 用 ""+
var str = ""+ 1234;
console.log(typeof str); // string
```
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