lovecoding
/
class


			
				
					
						
						
							12345678910111213141516171819202122232425262728293031323334353637
							<!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>
        // 单行注释 ctrl + /
        /**
         * 多行注释
        */
        // 1.定义数组
       var arr1 = [];
       var arr2 = new Array();
        var arr3 = [1,2,'hahah','kfldklf'];
       arr1[0] = "c";
       arr1[1] = false;
       arr1[2] = 4;
       console.log(arr1,'1');
        //如何获取数组长度
        console.log(arr1.length)
       console.log(arr3,'3');
       console.log(arr3[2],'获取');
        // 遍历数组
        for(var i=0;i<arr3.length;i++){
            console.log(i,'i');//0 1 2 3
            document.write(arr3[i] + '<br/>')
        }
        

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