非响应式的JS的数组方法join,trim,map,reduce,filter,find,every,indexOf()
reducehttps://www.jianshu.com/p/e375ba1cfc47这篇文章绝了joinjoin,就是把数组转换成字符串,然后给他规定个连接字符,默认的是逗号(,),书写格式:join(""),括号里面写字符串(“要加引号”),vararr=[1,2,3];console.log(arr.join());//1,2,3console.log(arr.join("-"));//1