1. eval().
function ConvertStringToJsonForJs() {
var testJson = '{"family_name":"huang","family_mamber":[{"age":"12","name":"zheng"},{"age":"12","name":"yuen"}]}';
testJson = eval("(" + testJson + ")");
alert(testJson.family_name);
}
2. jQuery.
function ConvertToJsonForJq() {
var testJson = '{"family_name":"huang","family_mamber":[{"age":"12","name":"zheng"},{"age":"12","name":"yuen"}]}';
testJson = $.parseJSON(testJson);
alert(testJson.family_name);
}