how to make string as array in java script?

You are looking for String.split. In your case, you need to split twice. Once with ; to split the string into chunks, then separately split each chunk with , to reach the array structure you are looking for.

function chunkSplit(str) {
 var chunks = str.split(';'), // split str on ';'
 nChunks = chunks.length, 
 n = 0;
 for (; n < nChunks; ++n) { 
 chunks[n] = chunks[n].split(','); // split each chunk with ','
 }
 return chunks;
}
var arr = chunkSplit("1,2,3;4,5,6;7,8,9;a,b,c;d,e,f;g,h,i");

If you need a multi-dimensional array you can try :

var array = yourString.split(';');
var arrCount = array.length;
for (var i = 0; i < arrCount; i++)
{
 array[i] = array[i].split(',');
}

Try the following:

var yourString = '1,2,3;4,5,6;7,8,9;a,b,c;d,e,f;g,h,i';
var array = [];
yourString.split(';').forEach(function(value) {
 array.push(value.split(','));
});

• jsFiddle Demo
• Note: .forEach() not supported in IE <=8

The following split command should help:

 yourArray = yourString.split(";");

• javascript
• arrays
• split