jquery中dom操作和事件的实例学习-表单验证

很显然，这样做能提升更好的用户体验。
html代码：
复制代码代码如下:

jquery代码：
复制代码代码如下:

好，现在来详细分析下里面的jquery语句。
先看dom操作的语句
$('form:input') 这个是用来查找form元素下所以的,

,<select>,<button>元素。 <BR>类似的还有$(':text'),$(':checkbox')等。反正只要明白只有在表单内，通过表单选择器都能得到相应的元素。 <BR>parent()是找到匹配元素的父节点。find()是来搜索与表达式匹配的元素。remove()是用来删除元素。 <BR>is()是用一个表达式来检查当前选择器的元素集合，如果存在至少一个匹配元素，则返回 true。 <BR>appendTo()是把一个元素添加到令一个元素中 <BR>triggerHandler()这一个特点方法会触发元素上的特定事件。 <BR>再看事件的语句。 <BR>keyup()是按键向上时触发。 <BR>理解每个方法后应该不难理解上面的代码 <BR>可能对于这句代码有疑问。 $parent.find(".formtips").remove(); <BR>这句是为了保证后面提示的元素只有一个。如果没有这句，就会一直添加提示的元素。</div>
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