其它数据类型转 boolean

Posted 2020-08-19

大体分两种：隐式类型转换和显式类型转换

隐式类型转换用 !!

 var str = "abc";
 str = !!str;
 console.log(typeof str);  //boolean

 

显式类型转换用Boolean()

var str = "abc";
str = Boolean(str);
console.log(typeof str); //boolean