[]为什么字符串不能连接？

private getRandomColor():String
{
let arr:Array<String>=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
let str:String="#";
for(let i:number=0;i<6;i++){
let index:number=arr.length*Math.random();
str+=arr[index];//在IDE里面这句报错 [ts] Operator '+' cannot be applied to types 'String' and 'String'.
}
return str;
}

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3 个回复

Laya_XS

赞同来自:

string类型不是String类型，别搞错了，都给你提示了，你自己的字符串类型写错了！这样就行了：

private getRandomColor():string
{
let arr:Array<String>=["0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"];
let str:string="#";
for(let i:number=0;i<6;i++){
let index:number=arr.length*Math.random();
str += arr[index];//在IDE里面这句报错 [ts] Operator '+' cannot be applied to types 'String' and 'String'.
}
return str;
}