js json 对象转换

var  json = 

{"user_id":"1713619613","customer_id":"12","customer_name":"\u6768\u6d3b\u9f99","content":"\u4f3c\u7684\u53d1\u963f\u5730\u65b9\u4f3c\u7684","addtime":1375193132,"id":"74","updatetime":null}

var  obj = eval( "("  + json +  ")" );