Number转换为字符串其实还有一种方法

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#1 Created at ... [Delete] [Delete and Lock User]

var a = 123+'';
console.log(typeof a);//String

#2 Created at ... [Delete] [Delete and Lock User]

let nub = '6' - - '5'

console.log(nub) // 11 number

#3 Created at ... [Delete] [Delete and Lock User]

隐式类型转换，自己给自己挖坑