前端作业-JavaSctipt 07-07作业

命名规则：
—变量和函数为驼峰式，第一个单词首字母为大写；
—连接属性下划线为连接
—不能数字为开头

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        function getName(name){
            return "Welconme to" + name;
        }
        //调用
        console.log(getName('朱老师'));
      //重写
      function  getName(name,city){
          return "欢迎来自"+city+"的"+name;
      }
    console.log(getName("谢老师","都匀"))
    console.log(sum(600,800));
    function sum(a=4,b){
        return a +b;
    }
    console.log(sum(300));
    //归并参数。rest
    sum =function (... arr){
     //   console.log(arr);
    //   let res =0;
    //   for(let i=0; i<arr.length;i++){
    //       res += arr[i];
    //     }
    //   return res;
    }
    let a1 =[1,2,3,4,5,6,7];
    //console.log(sum(1,2,3,4,5,6,7));
    //console.log(sum(a1));
    console.log(sum(...a1));
    function getProduct(){
        return [123,"手机",654987,"HUAWEI"];
    }
    let mobile=getProduct();
    console.log(mobile);
    console.log(mobile[3]);
    function getProduct(){
        return {id:123,name:"手机","my price":654987,brand:"HUAWEI"};
    }
    console.log(mobile["my price"]);
     sum =(a,b) => {
        return a +b;
    };
    console.log(sum(10,20));
/*
    let getName=function(name){
        return "hello" +name;
    }
*/
    getName=name =>{
        return "Hello3"+ name;
    }
    console.log(getName("老猪"));
  //单一函数 可以省略 
    sum=(a,b)=>a+b;
    console.log(sum(80,50));
    //声明
    function sun(a,b){
        return a+b;
    };
    //调用
  console.log(sum(50,60));
//简化声明 用圆括号包住，使之转为表达式
(function sum(a,b){
    console.log(a+b);
})(40,20);
 </script>
</body>
</html>

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