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1、表单验证&lt;form&gt;&lt;/form&gt;(1).非空验证（去空格）(2).对比验证（跟一个值对比）(3).范围验证（根据一个范围进行判断）(4).固定格式验证：电话号码，身份证号，邮箱，信用卡号等的验证；需要用到正则表达式来进行验证。(5).其它验证2、正则表达式用符号来描述书写规则:/ 中间写正则表达式 /^ ：匹配开头，$：匹配结尾 ； /^ve/以ve开头的 /ve$/以ve结尾\d：一个任意的数字\w：一个任意的数字或字母\s：任意字符串{n}：把左边的表达式重复n遍{m,n}：把左边的表达式重复至少m遍，至多n遍 &nbsp;&nbsp;&nbsp; {m, }：把左边的表达式重复至少m遍，,至多不限+：左边的表达式，至少出现一次，至多不限，相当于{1，}*：左边的表达式，至少出现0次，至多不限，相当于{0，}?：左边的表达式，至少出现0次，至多出现1次，相当于{0，1}[a,b,c]：只能取方括号中内容之一[a-z]或[1-9]：在范围中取其一|：代表或者； （）：优先级； \：转义--“”这个才是要出现的小括号，需要转义3、事件事件有三要素：事件源、事件数据、事件处理程序可以加return false;是阻止默认操作onclick: 鼠标单击触发ondblclick: 双击触发onmouseover: 鼠标移动上面触发onmouseout: 鼠标离开时触发onmousemove: 鼠标在上面移动时触发onchange: 只要内容改变触发onblur: 失去焦点时触发onfocus: 获得焦点时触发onkeydown: 按键按下的时候触发onkeyup：按键抬起来的时候触发onkeypress：事件在用户按下并放开任何字母数字键时发生。但是系统按钮（例如：箭头键、功能键）无法得到识别。例子：根据正则表达式验证邮箱<pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;function&nbsp;checkemail()</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;v4&nbsp;=&nbsp;trim(u4.value);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;reg&nbsp;=&nbsp;/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;if(v4.match(reg)&nbsp;!=&nbsp;null)</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;imgs4.setAttribute(&quot;src&quot;,&quot;imges/1.png&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;true;</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;}</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;else</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;imgs4.setAttribute(&quot;src&quot;,&quot;imges/2.png&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;false;</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;}</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;}</pre>正则表达式补充：建立正则表达式的方法：<a title="复制代码" href="http://www.cnblogs.com/wleaves/p/javascript:void(0);" style="margin: 0px; padding: 0px; color: black;">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</a><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">var&nbsp;patten=&nbsp;new&nbsp;RegExp(/^[0-9]{17}[0-9|X]$/);/*</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">RegExp()括号里面的式子需要自己定义：</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">1、[]里面只有一个元素</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">2、()里面可以写一个单词或者式子
3、{}里面表示数量&nbsp;
4、^：以某个元素开头，写在元素前面&nbsp;
5、$：以某个元素结束，写在元素后面*/</pre>&nbsp;例：1、正则表达式验证身份证：&nbsp;身份证：&lt;input type=&quot;text&quot; id=&quot;1&quot;&nbsp; /&gt;&nbsp;/*javascript部分*/<pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;var&nbsp;a=&nbsp;document.getElementById(&quot;1&quot;).value;</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;var&nbsp;patten=&nbsp;new&nbsp;RegExp(/^[0-9]{17}[0-9|X]$/);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;if(patten.test(a))</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert(&quot;输入正确&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;}</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;else</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert(&quot;输入错误&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;}</pre>&nbsp;2、正则表达式验证邮箱：&nbsp;邮箱：&lt;input type=&quot;text&quot; id=&quot;2&quot; /&gt;&lt;input type=&quot;button&quot; value=&quot;提交&quot; onclick=&quot;mail()&quot; /&gt;&nbsp;<pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">function&nbsp;mail()</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;patten2=&nbsp;new&nbsp;RegExp(/^[0-9|A-z|_]{1,17}[@][0-9|A-z]{1,3}.(com)$/)</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;var&nbsp;mail&nbsp;=&nbsp;document.getElementById(&quot;2&quot;).value;</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;if(patten2.test(mail))</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert(&quot;输入正确&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;else</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;{</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;alert(&quot;输入错误&quot;);</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;}</pre><pre style="margin-top: 0px; margin-bottom: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-size: 14px; background-color: rgb(238, 238, 238);">}</pre>&nbsp;&nbsp;常用正则表达式：&nbsp;&nbsp;&nbsp; 匹配国内电话号码：d{3}-d{8}|d{4}-d{7}&nbsp; &nbsp;&nbsp;&nbsp; 评注：匹配形式如 0511-4405222 或 021-87888822&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 匹配腾讯QQ号：[1-9][0-9]{4,}&nbsp; &nbsp;&nbsp;&nbsp; 评注：腾讯QQ号从10000开始&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 匹配中国邮政编码：[1-9]d{5}(?!d)&nbsp; &nbsp;&nbsp;&nbsp; 评注：中国邮政编码为6位数字&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 匹配身份证：d{15}|d{18}&nbsp; &nbsp;&nbsp;&nbsp; 评注：中国的身份证为15位或18位&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 匹配ip地址：d+.d+.d+.d+&nbsp; &nbsp;&nbsp;&nbsp; 评注：提取ip地址时有用&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;匹配特定数字：&nbsp; &nbsp;&nbsp;&nbsp; ^[1-9]d*$&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;//匹配正整数&nbsp; &nbsp;&nbsp;&nbsp; ^-[1-9]d*$ &nbsp;&nbsp;&nbsp;//匹配负整数&nbsp; &nbsp;&nbsp;&nbsp; ^-?[1-9]d*$&nbsp;&nbsp;&nbsp; &nbsp;//匹配整数&nbsp; &nbsp;&nbsp;&nbsp; ^[1-9]d*|0$&nbsp; &nbsp;//匹配非负整数（正整数 + 0）&nbsp; &nbsp;&nbsp;&nbsp; ^-[1-9]d*|0$&nbsp;&nbsp;&nbsp; &nbsp;//匹配非正整数（负整数 + 0）&nbsp; &nbsp;&nbsp;&nbsp; ^[1-9]d*.d*|0.d*[1-9]d*$&nbsp;&nbsp;&nbsp; &nbsp;//匹配正浮点数&nbsp; &nbsp;&nbsp;&nbsp; ^-([1-9]d*.d*|0.d*[1-9]d*)$&nbsp; &nbsp;//匹配负浮点数&nbsp; &nbsp;&nbsp;&nbsp; ^-?([1-9]d*.d*|0.d*[1-9]d*|0?.0+|0)$&nbsp; &nbsp;//匹配浮点数&nbsp; &nbsp;&nbsp;&nbsp; ^[1-9]d*.d*|0.d*[1-9]d*|0?.0+|0$&nbsp;&nbsp;&nbsp; &nbsp;//匹配非负浮点数（正浮点数 + 0）&nbsp; &nbsp;&nbsp;&nbsp; ^(-([1-9]d*.d*|0.d*[1-9]d*))|0?.0+|0$&nbsp;&nbsp;&nbsp; //匹配非正浮点数（负浮点数 + 0）&nbsp; &nbsp;&nbsp;&nbsp; 评注：处理大量数据时有用，具体应用时注意修正&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;匹配特定字符串：&nbsp; &nbsp;&nbsp;&nbsp; ^[A-Za-z]+$&nbsp;&nbsp;&nbsp; //匹配由26个英文字母组成的字符串&nbsp; &nbsp;&nbsp;&nbsp; ^[A-Z]+$&nbsp;&nbsp;&nbsp; //匹配由26个英文字母的大写组成的字符串&nbsp; &nbsp;&nbsp;&nbsp; ^[a-z]+$&nbsp;&nbsp;&nbsp; //匹配由26个英文字母的小写组成的字符串&nbsp; &nbsp;&nbsp;&nbsp; ^[A-Za-z0-9]+$&nbsp;&nbsp;&nbsp; //匹配由数字和26个英文字母组成的字符串&nbsp; &nbsp;&nbsp;&nbsp; ^w+$&nbsp;&nbsp;&nbsp; //匹配由数字、26个英文字母或者下划线组成的字符串&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;在使用RegularExpressionValidator验证控件时的验证功能及其验证表达式介绍如下:&nbsp; &nbsp;&nbsp;&nbsp; 只能输入数字：“^[0-9]*$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入n位的数字：“^d{n}$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入至少n位数字：“^d{n,}$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入m-n位的数字：“^d{m,n}$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入零和非零开头的数字：“^(0|[1-9][0-9]*)$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入有两位小数的正实数：“^[0-9]+(.[0-9]{2})?$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入有1-3位小数的正实数：“^[0-9]+(.[0-9]{1,3})?$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入非零的正整数：“^+?[1-9][0-9]*$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入非零的负整数：“^-[1-9][0-9]*$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入长度为3的字符：“^.{3}$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入由26个英文字母组成的字符串：“^[A-Za-z]+$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入由26个大写英文字母组成的字符串：“^[A-Z]+$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入由26个小写英文字母组成的字符串：“^[a-z]+$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入由数字和26个英文字母组成的字符串：“^[A-Za-z0-9]+$”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入由数字、26个英文字母或者下划线组成的字符串：“^w+$”&nbsp; &nbsp;&nbsp;&nbsp; 验证用户密码:“^[a-zA-Z]w{5,17}$”正确格式为：以字母开头，长度在6-18之间，&nbsp; &nbsp;&nbsp;&nbsp; 只能包含字符、数字和下划线。&nbsp; &nbsp;&nbsp;&nbsp; 验证是否含有^%&amp;&#39;&#39;,;=?$&quot;等字符：“[^%&amp;&#39;&#39;,;=?$x22]+”&nbsp; &nbsp;&nbsp;&nbsp; 只能输入汉字：“^[u4e00-u9fa5],{0,}$”&nbsp; &nbsp;&nbsp;&nbsp; 验证Email地址：“^w+[-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$”&nbsp; &nbsp;&nbsp;&nbsp; 验证InternetURL：“^http://([w-]+.)+[w-]+(/[w-./?%&amp;=]*)?$”&nbsp; &nbsp;&nbsp;&nbsp; 验证电话号码：“^((d{3,4})|d{3,4}-)?d{7,8}$”&nbsp; &nbsp;&nbsp;&nbsp; 正确格式为：“XXXX-XXXXXXX”，“XXXX-XXXXXXXX”，“XXX-XXXXXXX”，&nbsp; &nbsp;&nbsp;&nbsp; “XXX-XXXXXXXX”，“XXXXXXX”，“XXXXXXXX”。&nbsp; &nbsp;&nbsp;&nbsp; 验证身份证号（15位或18位数字）：“^d{15}|d{}18$”&nbsp; &nbsp;&nbsp;&nbsp; 验证一年的12个月：“^(0?[1-9]|1[0-2])$”正确格式为：“01”-“09”和“1”“12”&nbsp; &nbsp;&nbsp;&nbsp; 验证一个月的31天：“^((0?[1-9])|((1|2)[0-9])|30|31)$”&nbsp; &nbsp;&nbsp;&nbsp; 正确格式为：“01”“09”和“1”“31”。&nbsp; &nbsp;&nbsp;&nbsp; 匹配中文字符的正则表达式： [u4e00-u9fa5]&nbsp; &nbsp;&nbsp;&nbsp; 匹配双字节字符(包括汉字在内)：[^x00-xff]&nbsp; &nbsp;&nbsp;&nbsp; 匹配空行的正则表达式：n[s| ]*r&nbsp; &nbsp;&nbsp;&nbsp; 匹配HTML标记的正则表达式：/&lt;(.*)&gt;.*|&lt;(.*) /&gt;/&nbsp; &nbsp;&nbsp;&nbsp; 匹配首尾空格的正则表达式：(^s*)|(s*$)&nbsp; &nbsp;&nbsp;&nbsp; 匹配Email地址的正则表达式：w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*&nbsp; &nbsp;&nbsp;&nbsp; 匹配网址URL的正则表达式：<a href="http://%28[w-]+.%29+[w-]+%28/%5bw" style="margin: 0px; padding: 0px; color: black;">http://([w-]+.)+[w-]+(/[w</a>- ./?%&amp;=]*)?&nbsp;