网页html错误:Uncaught TypeError: Cannot read property 'addEventListener' of null 忘是亡心i 2022-05-03 11:58 115阅读 0赞 <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> <script> document.getElementById("myBtn").addEventListener("click", function(){ document.getElementById("demo").innerHTML = "Hello World"; }); </script> </head> <body> <p>该实例使用 addEventListener() 方法来向按钮添加点击事件。</p> <button id="myBtn">点我</button> <p id="demo"></p> </body> </html> 标签元素还没有创建就调用引用标签的脚本就会出现此问题,将脚本放置在脚本标签的后面就可以了 <head> <meta charset="utf-8"> <title>菜鸟教程(runoob.com)</title> </head> <body> <p>该实例使用 addEventListener() 方法来向按钮添加点击事件。</p> <button id="myBtn">点我</button> <p id="demo"></p> <script> document.getElementById("myBtn").addEventListener("click", function(){ document.getElementById("demo").innerHTML = "Hello World"; }); </script> </body> </html>
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