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<!DOCTYPE html> <html> <body> <p>在此示例中，我们省略了最后一个参数，并在循环内递增了计数器变量。</p> <p>单击该按钮可按升序遍历数组的索引。</p> <button onclick="myFunction()">试一试</button> <p id="demo"></p> <script> function myFunction() { var cars = ["BMW", "Volvo", "Saab", "Ford"]; var i = 0; var len = cars.length; var text = ""; for (; i < len;) { text += cars[i] + "<br>"; i++; } document.getElementById("demo").innerHTML = text; } </script> </body> </html>