<!DOCTYPE html>charset="utf-8"W3Cschool教程(w3cschool.cn)点击按钮,测试带有 break 语句的循环。onclick="myFunction()"点击这里id="demo"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;}