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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                元素批量添加事件: 概述:在一些特定的場景下,有很多相同節點(標簽)需要添加相同的相同的事件,就可以批量添加事件。 ``` +function(vsss){ sv[vsss].onclick=function(){ sv[vsss].style.color="red"; } ``` 閉包事件 函數上下文 this 概述:在函數的函數體中是有函數上下文this概念。 (當用戶觸發了元素事件的時候,函數上下文即為觸發這個事件的元素。 ``` <script type="text/javascript"> var sv=document.getElementsByTagName("li"); for(var i=0;i<sv.length;i++){ sv[i].onclick=function(){ this.style.color="red"; } } </script> ``` ## 代碼案例: ``` <!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> <style> ul{ width: 100%; height: 30px; background-color: bisque; display: block; } ul li{ float:left; display: block; margin-left: 25px; line-height:30px; } </style> </head> <body> <ul> <li>首頁</li> <li>新聞</li> <li>軍事</li> <li>知識</li> <li>好玩</li> </ul> </body> </html> <script type="text/javascript"> var sv=document.getElementsByTagName("li"); for(var i=0;i<sv.length;i++){ +function(vsss){ sv[vsss].onclick=function(){ sv[vsss].style.color="red"; } }(i); } </script> <script type="text/javascript"> var sv=document.getElementsByTagName("li"); for(var i=0;i<sv.length;i++){ sv[i].onclick=function(){ this.style.color="red"; } } </script> ```
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