初探javaScript

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    <title>Document</title>
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    <script>
        // 变量 命名规则，遵循驼峰式，或蛇形式
        let num = 12;   //值类型
        // 常量 一般字母全大写
        const P = 3.14; 
        // 数据类型    
        let str = "Hello";      //字符串
        let bool = true;        //布尔 (以及Null,Undefined类型)
        function printStr(){    
            console.log("值类型变量num:"+num+"常量P:"+P+"字符串类型str:"+str+"布尔类型bool:"+bool);
        }
        // 匿名函数
        let func = function (){
            console.log("值类型变量num:"+num+"常量P:"+P+"字符串类型str:"+str+"布尔类型bool:"+bool);
        }
        // 箭头函数转化
        let funct = () => console.log("值类型变量num:"+num+"常量P:"+P+"字符串类型str:"+str+"布尔类型bool:"+bool);
        function returnData(){
            return '返回值';
        }
        function returnData(...arr){
            let num = 0;
            for(let i = 0; i < arr.length; i ++){
                num += arr[i];
            }
            return num;
        }
        func();
        funct();
        returnData();
        let arr = [1,2,3,4,5,6]
        console.log(returnData(...arr)) //归并，若参数为数组，必须加...，否则无法展开
    </script>
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Correcting teacher：

天蓬老师

Correction status：qualified

Teacher's comments：

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初探javaScript