var num =10;
console.log(typeof num);//控制台检测出num是number型变量
var flag=true;
console.log(typeof flag);//控制台检测出flag是boolean型
并且prompt取过来的数据类型是字符型
Use typeof to get variable data type in JS
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Origin blog.csdn.net/qq_46161529/article/details/128862586
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