/2021/04/97f804a2.jpg" /2021/04/97f804a2.jpg" alt="2021040815150612067.jpg
问题:添加到脚本中被覆盖
<!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>php.cn</title> </head> <body> <button onclick="">按钮2</button> <script> const btn2=document.querySelector("button"); btn2.onclick=function(){ alert("你好"); } btn2.onclick=function(){ //这个会覆盖上面的onclick alert("我也很好"); } </script> </body> </html>
解决方法:
1. 将二者合并在一起
<script> const btn2=document.querySelector("button"); btn2.onclick=function(){ alert("你好"); alert("我也很好"); } </script>
2.添加事件监听器
<!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>php.cn</title> </head> <body> <button>按钮2</button> <script> const btn1=document.querySelector("button"); console.log(btn1); btn1.addEventListener("click",()=>alert("你好")); btn1.addEventListener("click",function(){ alert("我也很好") }); </script> </body> </html>
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