Detailed summary of js form events_basic knowledge
1。onabort（ns3，ns4，ie4）：当用户终止正在打开的网页时产生该事件。
2。onblur（ns3，ns4，ie3，ie4）：某元素失去活动焦点时产生该事件。例如鼠标在文本框中点击后又在文本框外点击时就会产生。
3。onchange（ns3，ns4，ie3，ie4）：当网页上某元素的内容发生改变时产生。例如在文本框中输入文本后又在文本框外点击时就会产生。
4。onclick（ns3，ns4，ie3，ie4）单击网页上的某元素时产生
5。ondblclick（ns4，ie4）：双击网页上的元素时产生
6。onerror（ns3，ns4，ie4）：浏览器在打开网页的过程中发生错误时产生该事件
7。onfinish（ie4）：滚动文本条中的文本完成一次滚动时产生的事件
8。onfocus（ns3，ns4，ie3，ie4）网页上的元素获得焦点时产生该事件
9。onkeydown（ns4，ie4）按下任意键时产生该事件
10。onkeypress（ns4，ie4）按下任意键时并释放该键产生的事件
11。onkeyup（ns4，ie4）释放按下的按键产生该事件
12。onload（ns3、4，ie3、4）网页或图象调入完成后产生该事件
13。onmousedown（ns4，ie4）在网页的某元素上按下鼠标时产生该事件
14。onmousemove（ie3、4）在网页的某元素上移动鼠标时产生该事件
15。onmouseout（ns3、4，ie4）从网页的某元素移出鼠标时产生该事件
16。onmouseover（ns3、4，ie3、4）鼠标移入网页的某元素时产生该事件
17。onmouseup（ns4，ie4）释放按下的鼠标时产生该事件
18。onreset（ns3、4，ie3、4）复位表格时产生该事件
19。onresize（ns4，ie4）改变浏览器时产生该事件
20。onselect（ns3、4，ie3、4）选择文本框中的文本时产生该事件
21。onstart（ie4）滚动文本条中的文本开始滚动时产生该事件
22。onsubmit（ns3、4，ie3、4）提交表单时产生该事件
23。onunload（ns3、4，ie3、4）从当前的网页退出时产生该事件
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