Ask a regular

Ask a regular:
The data is sometimes like this:
["Two S", "Li S", "Wang S", "one S"]
[{"DEVID": 1, "area": "Guangzhou", "USERID": null, "USERNAME": "King S", "Devtype": null, "Devname": "IPad2", "Devimei": " IPAD2346523985687 "," isusable ": 1," binddate ":" 2013-05-13t09:05:33 "," UPDATEUSER ": null," UpdateTime ":" 0001-01-01t00 : 00:00 "}]
Or
["Two S", "Li S", "Wang S", "one S"]
Or
[{"DEVID": 1, "area": "Guangzhou", "USERID": null, "USERNAME": "King S", "Devtype": null, "Devname": "IPad2", "Devimei": " IPAD2346523985687 "," isusable ": 1," binddate ":" 2013-05-13t09:05:33 "," UPDATEUSER ": null," UpdateTime ":" 0001-01-01t00 : 00:00 "}]

How do you judge in your code whether this character contains [?].

Success:function (returnvalue) {                    //select                    var returnjson = returnvalue.split (' [')] [0] + '] ';                    var returnValue1 = ' [' + returnvalue.split ('] [') [1];

This can sometimes be an error, I want to use a regular to determine the existence of the character [to intercept the data

Reply to discussion (solution)

IndexOf () method

Isn't that JSON? Why do you want a string intercept?

Isn't that JSON? Why do you want a string intercept?
["Two S", "Li S", "Wang S", "one S") This paragraph should be taken out separately put in the drop-down box

[{"DEVID": 1, "area": "Guangzhou", "USERID": null, "USERNAME": "King S", "Devtype": null, "Devname": "IPad2", "Devimei": " IPAD2346523985687 "," isusable ": 1," binddate ":" 2013-05-13t09:05:33 "," UPDATEUSER ": null," UpdateTime ":" 0001-01-01t00 : 00:00 "}]
This section is going to form a form

Sometimes there are 2 pieces of data, sometimes only the latter. So I want to determine if there are 2 pieces of data. How do you write it?

IndexOf () method

var str= "Hello world!" A value greater than 0, with 2 segments of data, is intercepted. Otherwise it is a piece of data, the direct assignment does not intercept. Is that what it means? if (Returnvalue.indexof ("[") > 0) {   var Returnjson = Returnvalue.split ('] [') [0] + '] ';   var returnValue1 = ' [' + returnvalue.split ('] [') [1]; else{  var returnvalue;}

IndexOf () method

I tested it this way, var = "[ReturnValue]" When it is OK, but var returnvalue = "[1]";

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