is directly understood to mean that a property called Date is registered in window during initialization and assigns the function object instance (constructor) pointed to by the constructor attribute in the Date prototype object.
do not know whether it is correct?
window.Date=Date.prototype.constructor;call
Date.now() //1540818420088just verified
Date.myNow=function(){console.log("myNow")}
window.Date.myNow() // myNow 
// Date
window.Date = function(){};
// Date
window.Date.prototype.getTime = function(){ /* ... */ };
// Date
window.Date.now = function(){ return (new Date()).getTime() } I understand that it should be
window= {
Date: function Date(){
...
}}
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