类似于["1,2,3,4"]的数组
arr =["1,2,3,4"]
arr.replace(/\["|"]/g,'')就可以去除数组形式获取里面的值得到1，2,3,4如果是["1","2","3"]这种形式arr =["1","2","3"]arr.replace(/\[|]/g,'').replace(/\"/g, '')得到1,2,3
