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<!DOCTYPE html> <html> <body> <p>单击该按钮可循环五次代码块。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var text = ""; var i; for (i = 0; i < 5; i++) { text += "The number is " + i + "<br>"; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>