The 2nd case of Master's education suggests understanding variables and their scope

ValiDate (New Date ()) is this a constructor function?  The new Date () () is the parameter of this constructor? Is the object, the time object, are new out of the ~ constructor, is a special method.  It is used primarily to initialize an object when it is created, to assign an initial value to an object member variable, and to always use the new operator in the statement that creates the object. constructor also to ~ is the object prototype ~ Usually we have to new out with ~new an object ~ Object prototype, is also our usual class ~ actually JS strictly speaking is no class of ~ Object prototype, prototype object ~ These are the system comes with, you can also encapsulate their own prototype object ~ To use, the new Come out with

The 2nd case of Master's education suggests understanding variables and their scope