js中的 null 0
let arr = []
let obj = {}
let str = "";
console.log(arr,obj,str)
理解:
if(obj){
console.log("obj"); //输出
}
if(arr){
console.log("arr") //输出
}
if(str){
console.log("str")
}
else{
console.log("???"); //输出
}
sqmw
The awakening is always delayed, there seems to be some fog
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