条件注释判断浏览器<!--[if !IE]><!--[if IE]><!--[if lt IE 6]><!--[if gte IE 6]>

比眉伴天荒 2022-07-12 02:44 92阅读 0赞

除IE外都可识别

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 <th style="margin:0px; padding:3px; font-weight:normal; text-align:left; border:1px solid silver; border-collapse:collapse"> 项目</th> 
 <th style="margin:0px; padding:3px; font-weight:normal; text-align:left; border:1px solid silver; border-collapse:collapse"> 范例</th> 
 <th style="margin:0px; padding:3px; font-weight:normal; text-align:left; border:1px solid silver; border-collapse:collapse"> 说明</th> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> !</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if !IE]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The NOT operator. This is placed immediately in front of the&nbsp;feature,&nbsp;operator, or&nbsp;subexpression&nbsp;to reverse the Boolean meaning of the expression. NOT运算符。这是摆在马上的功能，运算符或子表达式扭转表达式的布尔意义的前面。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> lt</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if lt IE 5.5]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The less-than operator. Returns true if the first argument is less than the second argument. 小于运算符。如果第一个参数小于第二个参数，则返回true。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> lte</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if lte IE 6]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The less-than or equal operator. Returns true if the first argument is less than or equal to the second argument. 小于或等于运算。如果第一个参数是小于或等于第二个参数，则返回true。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> gt</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if gt IE 5]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The greater-than operator. Returns true if the first argument is greater than the second argument. 大于运算符。如果第一个参数大于第二个参数，则返回true。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> gte</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if gte IE 7]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The greater-than or equal operator. Returns true if the first argument is greater than or equal to the second argument. 大于或等于运算。如果第一个参数是大于或等于第二个参数，则返回true。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> ( )</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if !(IE 7)]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> Subexpression operators. Used in conjunction with boolean operators to create more complex expressions. 子表达式运营商。在与布尔运算符用于创建更复杂的表达式。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> &amp;</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if (gt IE 5)&amp;(lt IE 7)]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The AND operator. Returns true if all subexpressions evaluate to true. AND运算符。如果所有的子表达式计算结果为true，返回true。</td> 
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 <td align="middle" style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> |</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> [if (IE 6)|(IE 7)]</td> 
 <td style="margin:0px; padding:3px; border:1px solid silver; border-collapse:collapse"> The OR operator. Returns true if any of the subexpressions evaluates to true. OR运算符。返回true，如果子表达式计算结果为true。</td> 
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这样有效是有效,但是用HTML VALIDATOR里,报错,因为这个不符合XHTML 1.1的规范, 
如果把ELSE语句去掉,则正确.

方法1：

加载CSS2