- <!DOCTYPE html>
- <HTML lang="en">
- <head>
- <meta charset="UTF-8">
- <title>
- 第一个 JavaScript 计算页面
- </title>
- </head>
- <body>
- <script type="text/javascript">
- var s1 = "abc";
- alert(typeof s1);
- alert(s1.length);
- var s2 = new String("def");
- alert(typeof s2);
- alert(s2.length);
- var ymd = "2019-12-29".split("-");
- for (var i = 0; i < ymd.length; i++) {
- alert(ymd[i]);
- }
- /*String.prototype.getLength=function () {
- return this.getLength();
- }
- var l1=s1.getLength();
- alert(l1);
- var l2=s2.getLength();
- alert(l2);*/
- alert("abcdf".charAt(0)); //a
- alert("sunyuhuan".substr(2, 3)); //nyu
- alert("sunyuhuan".substring(2, 3)); //n
- alert("sun-yuhuan".replace("-", ','))
- </script>
- </HTML>
来源: http://www.bubuko.com/infodetail-3355483.html