lovecoding
/
Web1020


			
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							<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <ul>
        <li>1</li>
        <li>2</li>
        <li>3</li>
        <li>4</li>
        <li>5</li>
        <li>6</li>
    </ul>
    <script>
        let aLi = document.getElementsByTagName('li');
        // let arr = [1,2,3,4,5,6];
        // let arr2 = arr;
        // arr[0] = 100;
        // console.log(arr2);

        // ... 扩展运算符 
        // let arr = [1,2,3,4,5,6];
        // let arr2 = [...arr];
        // arr[0] = 100;
        // console.log(arr2);

        // let liList = [...aLi];
        // console.log(liList);

        // let arr1 = [1,2,3,4,5]
        // let arr2 = [6,7,8,9,10]
        // let arr3 = arr1.concat(arr2);
        // console.log(arr3);
        // let arr3 = [...arr1,...arr2];
        // console.log(arr3);

        // function foo(...arg){
        //     console.log(arg);
        // }
        // foo(1,2,3,4)


        // ...arg 在以下情况中 代表剩余参数
        // function foo(a,b,...arg){
        //     console.log(arg);
        // }
        // foo(1,2,3,4)

        // let obj = {
        //     name:'张三',
        //     age:18,
        //     sex:'男'
        // }
        // let obj3 = {
        //     school:"黑大"
        // }
        // let obj2 = {...obj,...obj3};
        // obj.name = '李四';
        // console.log(obj2);
        
        //foo(1,2,3,4,5,6,7....);
        //foo参数是不确定个数,要求foo返回所有参数的和
        
    </script>
</body>
</html>