javascript - JavaScript 对象字面量的有趣问题

Question

尝试运行此代码:

var oObject = {"COL_SEQ":16,"SERVICE_CD":0.000000,"SERVICE_ID":0.000000,"COL_NAME":"","COL_OPTION":"nosort nofilter","COL_CLASS":"REMOVE_PATIENT","COL_TYPE":"","COL_LABEL":"","COL_OPTION":""};

alert(oObject.COL_SEQ);
alert(oObject.COL_OPTION);
alert(oObject.COL_CLASS);

我希望第二个警报显示“nosort nofilter”，但事实并非如此；它会警告一条空白消息。

实例: http://jsfiddle.net/zD7Wm/

为什么会发生这种情况？

Answer 1

对象末尾有第二个(空)COL_OPTION，它将覆盖您的第一个。

如果你去掉第二个，你的代码就可以正常工作:

var oObject = {"COL_SEQ":16,"SERVICE_CD":0.000000,"SERVICE_ID":0.000000,"COL_NAME":"","COL_OPTION":"nosort nofilter","COL_CLASS":"REMOVE_PATIENT","COL_TYPE":"","COL_LABEL":""};