js uses ‘+’ before a data type. The purpose of this operation is to convert the data type to Number type. If the conversion fails, it will return NaN;
E.g:
+ '2' + 1 // 3 + [ 1 ] // NaN
+new Date() will call the valueOf method on Date.prototype, according to
new Date().getTime() === new Date().valueOf() //true
The following example returns the same effect:
console . log ( + new Date ( ) ) ; console . log…
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