1.函数声明语法

function sum(num1, num2){

  return num1 + num2;

}

 

2.函数表达式定义

var sum = function (num1, num2){

  return num1 + num2;

}

 

3.Function 构造函数

var sum = new Function("num1", "num2", "return num1 + num2");

 

函数是对象,函数名是指针

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