更新

2021-05-11 11:33:55 +08:00
parent 011d9328b0
commit c5f18c6051
32 changed files with 2011 additions and 26 deletions
--- a/teaching/lhj/kejian/js/shuzu.html
+++ b/teaching/lhj/kejian/js/shuzu.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+    <script>
+        var arr=[3,9,6,4,5]
+        var arr1=[1,'a','p']
+        console.log(arr1)
+        console.log(arr1[2])
+        // 访问数组的时候需要加上数组下标
+        // 数组下标从0开始
+
+
+        // 数组遍历 （用循环输出数组的每一项）
+        // for循环
+        // for in 
+        // for(let i=0;i<arr.length;i++){
+        //     console.log(arr[i])
+        // } 
+
+        // for(let i in arr1){
+        //     console.log(arr1[i],i)
+        // }
+
+        // 数组的操作
+        // 增删改查
+        // 增
+        var arr2=[1,2,3,4]
+        arr2.push('z')  //添加一个元素
+        // arr2[4]="m"
+        arr2.unshift("qq")
+        // console.log(arr2[4])
+        console.log(arr2,"1234")
+        arr2.splice(4,0,'m')
+        
+        
+
+        // 修改
+        arr2[3]=5
+        
+        arr2.splice(2,1,6)
+       
+
+        // 删除
+        arr2.splice(3,1)
+        console.log(arr.pop(),"zaza")
+        console.log(arr.shift(),"zaza")
+        console.log(arr2)
+
+        // 排序
+        arr.sort()
+        console.log(arr)
+        arr.reverse()
+        console.log(arr)
+
+        // 转换
+        var str=arr.toString()
+        // join(',')
+        console.log(str)
+        console.log(str.split(','))
+
+
+    </script>
+<body>
+    
+</body>
+</html>