Error in callback for watcher "city": "TypeError: Cannot read properties of undefined (reading 'value')"

引用中的原代码，问题出在watcher "city"的回调函数中。报错的原因是无法读取未定义的属性"value"。这可能是因为在回调函数中没有正确定义对应的属性。要解决这个问题，需要在watcher中检查回调函数中的属性是否正确定义，并确保正确引用该属性。<em>1</em><em>2</em><em>3</em>
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