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var str={"newName":{"3":"电池编辑人员","2":"电池组编辑人员","1":"管理员","6":"区域管理员","5":"充电站编辑人员","4":"充电卡编辑人员"}};
for (x in str.newName) alert(x + ':' + str.newName[x]);
<script>
var str={"newName":{"3":"电池编辑人员","2":"电池组编辑人员","1":"管理员","6":"区域管理员","5":"充电站编辑人员","4":"充电卡编辑人员"}};
alert(str.newName[3]);
</script>
$('#id_of_select option:selected').attr('id')
eval(str);
var user = str;
for (x in user.newName) alert(x + ':' + user.newName[x]);