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				+<!DOCTYPE html> 
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				+<html lang="en"> 
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				+<head> 
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				+    <meta charset="UTF-8"> 
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				+    <meta name="viewport" content="width=device-width, initial-scale=1.0"> 
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				+    <title>JS对象-DOM-获取元素对象</title> 
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				+</head> 
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				+<body> 
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				+    <img id="imgId" src="img/g0.jpeg" height="360px"> <br/><br/> 
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				+ 
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				+    <div class="clz">四福科技教育</div> 
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				+    <a href="http://www.wolfcode.cn" class="clz">广州xx</a> <br/><br/> 
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				+ 
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				+    <input  type="checkbox" name="hobby"> Java 
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				+    <input type="checkbox" name="hobby"> Python 
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				+ 
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				+    <button onclick="fun()">更换</button> 
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				+    <button onclick="fun1()">哇塞</button> 
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				+ 
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				+    <button onclick="allChecked()">全选</button> 
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				+    <button onclick="unall()">反选</button> 
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				+    <script> 
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				+        // 1 跟换美女 
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				+        function fun() { 
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				+            document.getElementById("imgId").src = "img/g1.jpeg" 
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				+        } 
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				+        // 2 在所有 class="clz" 的标签内容后面加:很哇塞 
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				+        function fun1() { 
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				+            var clzs = document.getElementsByClassName("clz") 
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				+            for(var i = 0;i<clzs.length ; i++){ 
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				+                var item = clzs[i]; 
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				+                item.innerHTML = item.innerHTML + "<font style='color:red'>很哇塞</font>" 
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				+            } 
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				+        } 
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				+        // 3 点击权限吧所有复选框修改成选中状态 , 点击反选修改成反选状态 
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				+        function allChecked() { 
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				+           console.log(123) 
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				+           var hobbys =  document.getElementsByName("hobby") 
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				+            console.log(hobbys) 
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				+            for (let i = 0; i < hobbys.length; i++) { 
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				+                // 修改复选框属性 , checked =  true 
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				+                hobbys[i].checked = true 
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				+            } 
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				+        } 
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				+ 
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				+        function unall() { 
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				+            console.log(123) 
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				+            var hobbys =  document.getElementsByName("hobby") 
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				+            console.log(hobbys) 
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				+            for (let i = 0; i < hobbys.length; i++) { 
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				+                // 修改复选框属性 , checked =  true 
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				+                hobbys[i].checked = !hobbys[i].checked 
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				+            } 
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				+        } 
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				+ 
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				+        
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				+    </script> 
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				+</body> 
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				+</html> 
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