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Enumerate properties in objects

2022-07-22 19:11:00 【Please call me Gerald 6】

Many times in development , We want to know what properties are in the object , At this time, we often need to use the attributes in the enumeration object
grammar ：
for（var Variable in object ）{

}
for…in sentence , There are several properties in the object , The circulatory body will execute several times
Every time it is executed , The name of an attribute in the object will be assigned to the variable
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