javascript中的数组转换成字符串用toString()，或者用join()。
将数组和字符串用+连接，赋给一个变量，这个变量自动转变成字符串了。
字符串转换成数组用split(',')
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>js中数组和字符串的互转</title> </head> <body> <script> var msgsnew = ["test", "test", "test", "test", "test"]; //var tstr=msgsnew.join() var tstr = msgsnew.join(','); //数组转字符串 console.log("tstr", tstr); var tstrtwo = msgsnew.toString(); //数组转字符串 var tstrthree = "可以转字符串的" + msgsnew //js中的+ console.log("+后转变成字符串的", tstrthree, typeof tstrthree); console.log("数组:" + msgsnew + ":" + (msgsnew instanceof Array), "数组转字符串:" + tstrtwo + ":" + (tstrtwo instanceof Array)); console.log(msgsnew); var tarra = tstr.split(','); //字符串转数组 console.log(msgsnew instanceof Array, typeof tstr, tarra); </script> </body> </html>