JavaScript对象文字的有趣问题

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”，但它没有;它会发出空白信息。

实例： http://jsfiddle.net/zD7Wm/

为什么会这样？

Answer 1

在对象的末尾有第二个（空）COL_OPTION，它会覆盖你的初始值。

如果你取出第二个，你的代码可以正常工作：

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":""};