js换行

"render" : function(data, type, full, meta) {
var str1 = "";
var len = "";
if (data.length > 15) {
for (var i = 0, len1 = data.length / 15; i < len1; i++) {
str1 = data.substring(0, 16);
data = data.replace(str1, "");
len = len + str1 + "\n";
}
len=len+data;
return len;
} else {
return data;
}
}