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Tryit: JAVASCRIPT
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<!DOCTYPE html> <html> <body> <p>单击按钮等待 3 秒，然后提示“Hello”。</p> <button onclick="myFunction()">试一试</button> <script> var myVar; function myFunction() { myVar = setTimeout(alertFunc, 3000); } function alertFunc() { alert("Hello!"); } </script> </body> </html>