If a property has not been defined before, then it will be created during assignment.
如果属性在以前没有定义上，在赋值时就会创建出来。
Make sure your assignment fits the range for the property to which it is made.
确保赋值在属性接受的赋值范围内。
Use the property name on the left side of an assignment statement.
请在指派陈述式的左边使用属性名称。
Use the property name on the left side of an assignment statement.
请在指派陈述式的左边使用属性名称。
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