aaaa

2021-06-03 10:52:41 +08:00
parent c5f18c6051
commit 907511778b
54 changed files with 3540 additions and 50 deletions
--- a/teaching/lhj/kejian/js/this.html
+++ b/teaching/lhj/kejian/js/this.html
@@ -0,0 +1,62 @@
+<!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>
+        // "use strict";
+        // this 
+        // 1. 谁调用 就指向谁   指向目标是一个对象
+        // 2. 如果没有对象调用他 就指向全局对象（window）
+        var a=1
+        // var name;
+        // console.log(a)
+        // console.log(window.a)
+        // console.log(this.a) //1
+        // var name="华晨宇"
+        var obj={
+            name:"asd",
+            echoname:function(){
+                console.log(this.name)
+            }
+        }
+        // obj.echoname()
+
+        function a(){
+            var user = "追梦子";
+            console.log(this.user); 
+            console.log(this);  // window
+        } 
+        // a();
+       
+        function myFunction() {
+            "use strict";
+            console.log(this);
+        }
+        // myFunction()
+    // function fnza(){
+    //     console.log(this.name)
+    // }
+    // fnza()
+    // fnza.name="asd"
+    // window.name="qwe"
+    // console.log(fnza.name)
+
+
+    function foo() { 
+    console.log( this.a ,"jkjkjkjkjk");
+}
+var obj = { 
+    a: 2,
+    foo: foo 
+};
+var a = "xxxxx"
+setTimeout( obj.foo ,100);
+    </script>
+</head>
+<body>
+    
+</body>
+</html>