JavaScript重载解读

    在JavaScript有一个特殊的数据类型---Function种类，JavaScript每个功能Function的类型，例如可以。由于函数是对象。指针，不会与某个函数绑定。

<pre name="code" class="html">function sum(num1,num2)
{
return num1 +num2;
}

alert(sum(10,10));        //20
var other = sum;
alert(other(10,10));        //20
sum = null;
alert(other(10,10));        //20

function sum(num1)
{
return num1 +100;
}
 function sum(num1)
{
return num1 +200;
}
alert(sum(200));        //400

function sum(num1)
{
return num1 +100;
}
sum = function(num1)
{
return num1 +200;
}
alert(sum(200));        //400