二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

1、什么是事件

  JavaScript 创建动态页面。事件是可以被 JavaScript 侦测到的行为。 网页中的每个元素都可以产生某些可以触发 JavaScript 函数或程序的事件。

  比如说,当用户单击按钮或者提交表单数据时,就发生一个鼠标单击(onclick)事件,需要浏览器做出处理,返回给用户一个结果。

  主要事件表:

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" alt="" />

2、鼠标单击事件( onclick )

  onclick是鼠标单击事件,当在网页上单击鼠标时,就会发生该事件。同时onclick事件调用的程序块就会被执行,通常与按钮一起使用。

  比如,我们单击按钮时,触发 onclick 事件,并调用两个数和的函数add2()。代码如下:

  <html>
  <head>
    <script type="text/javascript">
    function add2(){
    var numa,numb,sum;
    numa=6;
    numb=8;
    sum=numa+numb;
     document.write("两数和为:"+sum); }
     </script>
  </head>
  <body>
   <form>
   <input name="button" type="button" value="点击提交" onclick="add2()" />
   </form>
  </body>
  </html>

  注意: 在网页中,如使用事件,就在该元素中设置事件属性。

3、鼠标经过事件(onmouseover)

  鼠标经过事件,当鼠标移到一个对象上时,该对象就触发onmouseover事件,并执行onmouseover事件调用的程序。

  现实鼠标经过"确定"按钮时,触发onmouseover事件,调用函数info(),弹出消息框,代码如下:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

4、鼠标移开事件(onmouseout)

  鼠标移开事件,当鼠标移开当前对象时,执行onmouseout调用的程序。

  当把鼠标移动到"登录"按钮上,然后再移开时,触发onmouseout事件,调用函数message(),代码如下:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

5、光标聚焦事件(onfocus)

  当网页中的对象获得聚点时,执行onfocus调用的程序就会被执行。

  如下代码, 当将光标移到文本框内时,即焦点在文本框内,触发onfocus 事件,并调用函数message()。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

6、失焦事件(onblur)

  onblur事件与onfocus是相对事件,当光标离开当前获得聚焦对象的时候,触发onblur事件,同时执行被调用的程序。

  如下代码, 网页中有用户和密码两个文本框。当前光标在用户文本框内时(即焦点在文本框),在光标离开该文本框后(即失焦时),触发onblur事件,并调用函数message()。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

7、内容选中事件(onselect)

  选中事件,当文本框或者文本域中的文字被选中时,触发onselect事件,同时调用的程序就会被执行。

  如下代码,当选中用户文本框内的文字时,触发onselect 事件,并调用函数message()。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

8、文本框内容改变事件(onchange)

  通过改变文本框的内容来触发onchange事件,同时执行被调用的程序。

  如下代码,当用户将文本框内的文字改变后,弹出对话框“您改变了文本内容!”。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

9、加载事件(onload)

  事件会在页面加载完成后,立即发生,同时执行被调用的程序。
  注意:1. 加载页面时,触发onload事件,事件写在<body>标签内。

      2. 此节的加载页面,可理解为打开一个新页面时。
  如下代码,当加载一个新页面时,弹出对话框“加载中,请稍等…”。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  注意上面的代码中onload要小写哈    

  运行结果:

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

10、卸载事件(onunload)

  当用户退出页面时(页面关闭、页面刷新等),触发onUnload事件,同时执行被调用的程序。

  注意:不同浏览器对onunload事件支持不同。

  如下代码,当退出页面时,弹出对话框“您确定离开该网页吗?”。

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应

  运行结果:(IE浏览器)

  二、JavaScript语言--JS基础--JavaScript进阶篇--事件响应  

案例:

使用JS完成一个简单的计算器功能。实现2个输入框中输入整数后,点击第三个输入框能给出2个整数的加减乘除。

<!DOCTYPE html>
<html>
<head>
<title> 事件</title>
<meta charset="utf-8">
<script type="text/javascript">
function count(){
//获取第一个输入框的值
var t1=document.getElementById('txt1').value;
//获取第二个输入框的值
var t2=document.getElementById('txt2').value;
//获取选择框的值
var t3=document.getElementById('select').value;
//获取通过下拉框来选择的值来改变加减乘除的运算法则
var result;
switch(t3){
case"+":result=Number(t1)+Number(t2);
break;
case"-":result=t1-t2;
break;
case"*":result=t1*t2;
break;
case"/":result=t1/t2;
break;
}
//设置结果输入框的值
document.getElementById('fruit').value=result;
} </script>
</head>
<body>
<input type='text' id='txt1' />
<select id='select'>
<option value='+'>+</option>
<option value="-">-</option>
<option value="*">*</option>
<option value="/">/</option>
</select>
<input type='text' id='txt2' />
<input type='button' value=' = ' onclick="count()" /> <!--通过 = 按钮来调用创建的函数,得到结果-->
<input type='text' id='fruit' />
</body>
</html>
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