<p>点击按钮,测试带有 break 语句的循环。</p> <button onclick="myFunction()">点击这里</button> <p id="demo"></p> <script> function myFunction(){ var x="",i=0; for (i=0;i<10;i++){ if (i==3){ break; } x=x + "该数字为 " + i + "<br>"; } document.getElementById("demo").innerHTML=x; } </script>