ルールを尋ねる

定期的なルールを要求します:
場合によっては、データは次のようになります:
["二s","李s","王s","一s"]
[{"DEVID":1,"Area": "広州" ,"USERID":null,"USERNAME":"王s","DEVTYPE":null,"DevName":"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate" :"2013 -05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001-01-01T00:00:00"}]
または
["二s","李s", "王s ","一s"]
または
[{"DEVID":1,"エリア":"広州","USERID":null,"USERNAME":"王s","DEVTYPE":null, "DevName" :"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate":"2013-05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001 -01- 01T00:00:00"}]

コード内にこの文字に ][ が含まれているかどうかを確認するにはどうすればよいですか?

success: function (returnValue) {                    //select                    var returnJson = returnValue.split('][')[0] + ']';                    var returnValue1 = '[' + returnValue.split('][')[1];

["二s","李s","王s","一s"] この段落は個別に取り出してドロップダウンボックスに配置する必要があります

[{"DEVID":1,"Area" :"広州" ,"USERID":null,"USERNAME":"王s","DEVTYPE":null,"DevName":"iPad2","DevIMEI":"IPAD2346523985687","IsUsable":1,"BindDate ":"2013 -05-13T09:05:33","UPDATEUSER":null,"UPDATETIME":"0001-01-01T00:00:00"}]

indexOf()メソッド

var str="Hello world!"//值大于0，有2段数据，则截取。否则就是一段数据，直接赋值不截取。是这个意思吗？if(returnValue.indexOf("][") > 0) {   var returnJson = returnValue.split('][')[0] + ']';   var returnValue1 = '[' + returnValue.split('][')[1];...}else{  var returnValue；}

<script type="text/javascript">function test(){    var returnValue = "[1][2]";if(returnValue.indexOf("][") > 0) {   var returnJson = returnValue.split('][')[0] + ']';   var returnValue1 = '[' + returnValue.split('][')[1];   alert(returnJson);   alert(returnValue1);}else{     alert(retuanValue);    }}</script><input type="button" value="测试" onclick="test()" /> //我这样测试了一下,var returnValue = "[1][2]"的时候是可以，但是var returnValue = "[1]";的时候就不行，该怎么做呢？