我在后台获得json格式如下：

[{"src":"C02020100AZ030100163332998.png","uploadtime":"2014/6/24/16:38:01","scantimes":"0","computercode":"C02020100AZ03010","photoaddress":"D:\autosaved\地铁秀秀\C02020100AZ030100163332998.png","isactive":"True","identityid":"0"},{"src":"C02020100AZ030100163333829.png","uploadtime":"2014/6/24/16:38:01","scantimes":"0","computercode":"C02020100AZ03010","photoaddress":"D:\autosaved\地铁秀秀\C02020100AZ030100163333829.png","isactive":"True","identityid":"0"}]

在前台取不了值？？？？？

前台：

success: function (data) {
var json = data;
$(json).each(function () {
li = document.createElement('li');
// li.innerText = 'Generated row ' + (++generatedCount);
li.innerHTML = '<img src="/MetroShow/Photo/' + this.src + '"/><br><center>日期;2014-07-25<center>';
el.insertBefore(li, el.childNodes[0]);
});

我尝试在前台用eval把json转换为对象还是取不了值，为什么取不了值呢？