易截截图软件、单文件、免安装、纯绿色、仅160KB

JavaScript中confirm,alert,prompt的用法

本文简要介绍JavaScript中confirm,alert,prompt的用法,希望大家学习过程中能得到一些启发。
window.confirm 参数就只有一个。显示提示框的信息。按确定,返回true;按取消返回false。
< SCRIPT> var bln = window.confirm("确定吗?"); alert(bln) < /SCRIPT> window.alert参数,只有一个,显示警告框的信息;无返回值。
< SCRIPT> window.alert("确定。") window.prompt参数,有两个,第一个参数,显示提示输入框的信息。第二个参数,用于显示输入框的默认值。返回,用户输入的值。
< SCRIPT> var str = window.prompt("请输入密码","password") alert(str); < /SCRIPT>


相关文档:

[翻译]High Performance JavaScript(026)

Use the Fast Parts  使用速度快的部分
    Even though JavaScript is often blamed for being slow, there are parts of the language that are incredibly fast. This should come as no surprise, since JavaScript engines are built in lower-level languages and are therefore compiled. Thou ......

[翻译]High Performance JavaScript(027)

第九章
Building and Deploying High-Performance JavaScript Applications
创建并部署高性能JavaScript应用程序
    According to a 2007 study by Yahoo!'s Exceptional Performance team, 40%–60% of Yahoo!'s users have an empty cache experience, and about 20% of all page views are done ......

[翻译]High Performance JavaScript(030)

第十章  Tools  工具
    Having the right software is essential for identifying bottlenecks in both the loading and running of scripts. A number of browser vendors and large-scale websites have shared techniques and tools to help make the Web faster and more efficient. This ......

jLayout — JavaScript Layout Algorithms


The jLayout JavaScript library provides layout algorithms for laying out components. A component is an abstraction; it can be implemented in many ways, for example as items in a HTML5 Canvas drawing or as HTML elements. The jLayout library allows you to focus on drawing the individual components i ......

javascript trim方法

在javascript中的string对象没有trim方法,所以trim功能需要自己实现:
代码如下:
Java代码
﹤scriptlanguage=”javascript”﹥   
/**  
*删除左右两端的空格  
*/  
String.prototype.trim=function(){      
  &nbs ......
© 2009 ej38.com All Rights Reserved. 关于E健网联系我们 | 站点地图 | 赣ICP备09004571号