如果需要为尚未指定的参数指派默认值怎么办？
What if you need to assign default values for parameters that aren't specified?
如果指定了var属性，那就把包含格式化日期的string值指派给指定的变量。
If the var attribute is specified, then a String value containing the formatted date is assigned to the named variable.
厨师助手：被指派到指定部门协助厨师工作。
Commis chef: an assistant chef allocated to a section to assist the chef.
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