/*javascript定義函數(shù)(聲明函數(shù))可以有三種方法：正常方法、構(gòu)造函數(shù)、函數(shù)直接量。*/

/*1.正常方法?function(param){}*/

function?print(msg)

{

document.write(msg,"");

}

/*如果函數(shù)不包含return?語句，只執(zhí)行函數(shù)體內(nèi)語句，并返回undefined*/

/*2.構(gòu)造函數(shù)方法：new?Function()*/

var?add1=new?Function('a','b','return?a+b');

/*3.函數(shù)直接量法，創(chuàng)建未命名函數(shù)，*/

var?result?=?function(x,y){return?x+y;};

/*也可以指定函數(shù)名*/

var?result2?=?function?fact(x){if(x<1)?return?1;else?return?x*fact(x-1)};

document.write('調(diào)用一般的方法：');

print("

---

");

print('調(diào)用構(gòu)造函數(shù)方法：add1(5,6)');

print(add1(5,6));

print("

---

");

print("調(diào)用函數(shù)直接量法:result(3,4)");

var?re?=result(3,4);

print(re);

print("調(diào)用函數(shù)直接量法:result2(3)");

print(result2(3));

print("

---

");

print('函數(shù)作為數(shù)據(jù)使用');

/*函數(shù)可以作為數(shù)據(jù)使用*/

function?add(x,y){return?x+y;}

function?subtract(x,y){return?x-y;}

function?multiply(x,y){return?x*y;}

function?divide(x,y){return?x/y;}

function?operate(operator,operand1,operand2)

{

return?operator(operand1,operand2);

}

//計算(2+3)?+?(4*5)

var?i?=?operate(add,operate(add,2,3),operate(multiply,4,5));

print('(2+3)?+?(4*5)='+i);

print("

---

");

//使用函數(shù)直接量

var?operators?=?new?Object();

operators['add']?=?function(x,y){return?x+y;}

operators['substract']?=?function(x,y){return?x-y;}

operators['multiply']?=?function(x,y){return?x*y;}

operators['divide']?=?function(x,y){return?x/y;}

operators['pow']?=?Math.pow;

function?operate2(op_name,operand1,operand2)

{

if(operators[op_name]?==?null)?return?"unknown?operator";

else?return?operators[op_name](operand1,operand2);

}

//定義"hello"?+?""?+?"world"

var?j?=?operate2("add","hello",operate2("add","?","world"));

var?k?=?operate2("pow",10,2);

print(j);

print(k);

print("

---

"); 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎勵來咯，堅持創(chuàng)作打卡瓜分現(xiàn)金大獎

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