<p>点击按钮循环代码5次。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var x=""; for (var i=0;i<5;i++){ x=x + "该数字为 " + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script>