Understanding the concept _javascript techniques in JavaScript without function overloading through an instance

Imagining the function name as a pointer also helps to understand why there is no concept of a function overload in ECMAScript. The following example:

Copy Code code as follows:

function Addsomenum (num)
{
return num+100;
}
function Addsomenum (num)
{
return num+200;
}
var result=addsomenum (100);//300

Obviously, this example declares two functions with the same name, and the result is that the following function overrides the previous function. The above code is actually consistent with the following code.

Copy Code code as follows:

var addsomenum=function (num)
{
return num+100;
};
var addsomenum=function (num)
{
return num+200;
};
var result=addsomenum (100);//300

By looking at the rewrite code, it's easy to see what's going on. When you create a second function, you actually overwrite the variable addsomenum that references the first function.

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