一,效果图。

二,代码。
- <!DOCTYPE html>
- <html>
- <head>
- <meta charset="utf-8">
- <title>javascript for循环</title>
- </head>
- <body>
- <script>
- cars = ["bmw", "volvo", "saab", "ford"];
- for (var i = 0; i < cars.length; i++) {
- document.write(cars[i] + "<br>");
- }
- </script>
- <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 + "the number is" + i + "<br>";
- }
- document.getElementById("demo").innerHTML = x;
- }
- </script>
- <p>点击下面的按钮,循环遍历对象"person"的属性</p>
- <button onclick="myFunction()">点击这里</button>
- <p id="demo1"></p>
- <script>
- function myFunction() {
- var x;
- var txt = "";
- var person = {
- fname: "bill",
- lname: "gates",
- age: 56
- };
- for (x in person) {
- txt = txt + person[x];
- }
- document.getElementById("demo1").innerHTML = txt;
- }
- </script>
- </body>
- </html>
参考资料:《菜鸟教程》