对于用来识别HTML页面上的元素的辅助技术来说，ID应该是惟一的，否则就会产生混乱，无法确定哪一个才是正确的元素。
For assistive technology to identify the element on the HTML page, the id should be unique, or there will be confusion about which element is the correct one.
当您需要基于工件的文本来定位工件时，或者您并不能确定工件属于哪一个项目时，目前为止讨论的页面和视图就不够用了。
When you need to locate an artifact based on text in that artifact or you are not sure which project the artifact belongs to, the pages and views discussed so far will no longer suffice.
您还需要向 updateEmployee 页面传递一个参数，以指示显示哪一个员工。
You also need to pass a parameter to the updateEmployee page to indicate which employee record to display.
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