function语法:
/*
ECMAScript 使用function关键字来声明,后跟一组参数及函数体。基本语法如下:
function functionName(arg0,arg1,arg2,...argN){
statements
}
*/
/*
function sayHi(name,message){
alert("Hello "+name+","+message);
}
//通过函数名传参调用
sayHi("tom","how are you today?");//result:Hello tom,how are you today?
*/
/*
function sum(num1,num2){
return num1+num2;
}
var result = sum(5,10);
alert(result);
*/
/*
function sum(num1,num2){
return num1+num2;
alert(num1+num2);//永远不会执......
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