lovecoding
/
web0715


			
				
					
						
						
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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>
    <script>
        var arr = [1,2,3,4,5,6,7,8,9];
        var arr1 = ["a","b","c","d"];

        // console.log(arr.length)//length 方法返回数组长度
        
        // var arr2 = arr.concat(arr1);
        // console.log(arr2);
        // 向数组最后添加一个新值
        // arr1.push("e");
        // console.log(arr1);
        // 向数组前方添加新值
        // arr1.unshift("aa");
        // console.log(arr1);
        // 删除数组中最后一个值
        // arr1.pop();
        // console.log(arr1);
        // 删除数组第一个值
        // var num1 = arr1.shift();
        //  console.log(arr1,num1);

        //数组转字符串
        // var str1 = arr1.join("-");
        // var str1 = arr1.join("");
        // console.log(str1);

        //字符串转数组
        // var str2 = "hello";
        // var arr3 = str2.split("");
        // console.log(arr3);

        // console.log(arr.includes(99));
        // console.log(arr.indexOf(99));

        // console.log(arr.reverse());

        // console.log(arr.slice(2,6),arr)
        // console.log(arr.splice(2,1,'a','b','c'),arr)

    </script>
</body>
</html>