lovecoding
/
W0407


			
				
					
						
						
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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>你好</li>
        <li>你好</li>
        <li>你好</li>
        <li>你好</li>
    </ul>
    <script>
        // 类数组 具备length 索引 但是不具备真是数组的方法
        // NodeList arguments
        function fn1() {
            console.log(arguments,'arguments')
            console.log(arguments[1],'arguments')
            console.log(arguments instanceof Array,'arguments instanceof Array')
        }
        fn1('a','b')
        // 类数组转换数组
        let arr1 = {0:1,1:2,2:3,length:3};
        console.log(arr1,'arr1');
        console.log(Array.from(arr1))
        let x = document.querySelectorAll('li');
        // console.log([...x]) 
        console.log(Array.prototype.slice.call(arr1));
        console.log(Array.apply(null,arr1));
    </script>
</body>
</html>