在一个Page里面，如果setData({key:value})中value对应的是一个objc对象，现在想要setData({key:{}}),需要提前对原先的objc进行属性遍历 delete objc的key吗？
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只是在考虑原有objc的会不会占用内存，从而导致page一些垃圾数据
setData({
"obj.age": value
})