timestamp = + new Date () calculated and assigned?
timestamp = + new Date () calculated and assigned?
+ variable
implicitly calls the variable's valueOf method and converts it to numeric type
var obj = {
toString(){
console.log('toString');
return '13'
},
valueOf(){
console.log('valueOf');
return []
}
}
console.log(+obj)// valueOf toString 13 first call valueOf if the value returned by valueOf is not the original value, it will continue to call toString and convert the string 13 to number 13
is equivalent to Date.now () timestamp assignment
new Date () is a Date object + is a unary operator that changes the following variable to a type of Number , which is equal to Number (new Date ()) .
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