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<!DOCTYPE html> <html> <body> <p>单击该按钮可循环遍历拥有四个元素的数组的索引，但当 i 等于“3”时退出循环。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var cars = ["BMW", "Volvo", "Saab", "Ford"]; var text = ""; var i; for (i = 0;; i++) { if (i == 3) { break; } text += cars[i] + "<br>"; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>