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There is a Reference to an object that does not exist.
有某个引用是对一个并不存在的对象。
youdao
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Modifies a property of the object, creating it if it does not already exist.
修改对象的属性，如果该属性不存在，则创建该属性并赋值。
youdao
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Modifies a property of the object, creating it if it does not already exist.
修改对象的属性，如果该属性不存在，则创建该属性并赋值。
youdao