Learning Notes ———— MAth. Method () and overloading.

--ceil () rounding up

--floor () rounding down

--round () rounding

--random () Gets the random number (pseudo-random number)

var intstr=math.random () *1000000

document.write (Math.floor (INTSTR));

--If STR is a JS code

var str= "alert (' 1234 ')";

eval (str); You can execute this code directly;

--encode () encode the encoding decode in Chinese and decode the encode

--isnan if it is a number, return False if not return true

var str1= "123";
Alert (IsNaN (STR1));

--parseint () type conversion

var str1= "123";

document.write (parseint (STR1) +1);

Overloads are not present in--js, but can be emulated in other ways

It can save the passed arguments in the arguments array q go

function Add ()
{
var sum=0;
for (var i=0;i<arguments.length; i++)
{
Sum+=arguments[i];
}
return sum;
}
alert (add);
Alert (Add (+))

Learning Notes ———— MAth. Method () and overloading.