使用css可以将图片的大小调整到一个固定的值
<span style="font-size: 16px">#mian img{
max-width:170px
width:170px
width:expression(document.body.clientWidth>170?"170px":"auto")
max-height:180px
height:180px
height:expression(document.body.clientWidth>180?"180px":"auto")
overflow:hidden
}
</span>
2.html代码中
如果图片的大小是事先未知的,这样设置可以使,图像的大小固定,从而不影响网页中其他块的结构
<span style="font-size: 16px"><div id = "maim">
<!--
在mian样式的块中img标签图片的大小会被固定在170px*180px
-->
<img src="01.jpg">
</div>
</span>
在网页前端设计过程中，少不了要使用边框，这样页面整体好看一些。边框通常分为两种，一种为实边框另一种为虚边框，实边框用得多一些，但有虚线或虚线边框点缀，网页会更漂亮，所以这两种边框都要使用。在CSS中，设置边框用border属性，通常需要设置三个值，分别为：宽度、线条样式和颜色。把线条设置为实线或虚线主要设置线条样式，它主要有两个值，即：solid 和 dashed，前者表示实线，后者表示虚线。
一、CSS设置虚线
html代码：
CSS设置虚线
使用dashed
CSS样式：
.uldashed{border:1px solid #c22159width:300pxheight:60pxmargin:0padding:0line-height:26px}
.uldashed li{border-bottom:1px dashed #c22159list-style:none}
效果图：CSS设置虚线
使用dashed
以上CSS样式是给ul的每一行设置一条虚线，虚实结合比单用实线好看得多。在实际应用中，最后一行的虚线要隐藏掉，这样美观一些，只要再设置一个CSS样式把 border-bottom 设置为 none 即可。
二、CSS设置虚线边框
html代码：
CSS设置一虚线
使用dashed
CSS样式：
.uldashedborder{border:1px dashed #c22159width:300pxheight:60pxmargin:0padding:0line-height:26pxpadding-bottom:23px}
.uldashedborder li{border-bottom:1px solid #c22159list-style:none}
效果图：CSS设置一虚线
使用dashed
以上的CSS样式是把边框设置为虚线，把行的底部设置为实线，跟上边恰好相反，效果没有上边的好看。一般来说，虚线常常用于实线边框内。
三、CSS 长虚线边框
html代码：
长虚线边框
CSS样式：
.longDashedBorder{position:relativemargin:68px 0 0 130pxheight:44pxwidth:86pxdisplay:inline-blockborder:dashed 1px #b200fftransform:scale(4)overflow:hidden}
.text{position:relativemargin:-54px 0 0 -106pxfloat:leftheight:150pxwidth:300pxline-height:28pxdisplay:inline-blocktransform:scale(0.28)}
效果图：
ee96bd1776d77c7f7c565d5cc3bf1f47.png
以上长虚线边框用 Css 放大属性 scale 实现，这样虚线会增长但不会加宽；如果只增长 X 轴方向，可以用 scalex；如果只增长 Y 轴方向，可以用 scaley。使用 scale，除放大边框外，还放大其它元素，需要把它们调回来，比较麻烦。
四、CSS 虚线间距
html代码：
CSS样式：
.dashedSpace {
width:350px
height:1px
margin-top:10px
background-image:linear-gradient(to right, #b200ff 0%, #b200ff 50%, transparent 50%)
background-size:28px 1px
background-repeat:repeat-x
}
.linear {
background-image: linear-gradient(to right, #ccc 0%, #b200ff 50%, transparent 50%)
background-size:40px 1px
}
效果图：
03cc24f8ec77382a351b9b73a6a9f5eb.png
dashed 样式的虚线不能调间距，只能用渐变生成函数 linear-gradient()，to right 表示从左到右渐变，#ccc 0% 表示起点颜色和颜色百分比，#b200ff 50% 表示终点颜色和颜色百分比，transparent 50% 表示透明度。
告诉你一个简单的方法 1.打开你要的css码的百度空间网页。 2.右击弹出中有一个“查看源文件（V）”，左击它。 3.弹出了一个记事本，按“Ctrl+F”（查找），输入 href,开始查找，第三个就是。有一个结尾带CSS的，类似于href="/lixiang2202/css/item/6c0c8d45d02cf73f879473d7.css"复制引号内的网址。 4.搜索//hi.baidu.com后面加刚才复制的网址 5.弹出了一个记事本文件，就是你要找的CSS代码了。 你可以看看我的 Http://hi.baidu.com/lixiang2202/css/item/6c0c8d45d02cf73f879473d7.css 按步骤试一试，不行的话找我来 Http://hi.baidu.com/lixiang2202 如果会了，别忘了采纳我啊！ 欢迎常来我的空间Http://hi.baidu.com/lixiang2202这是我曾经编的 参考一下吧JoneThan@Lee hi.baidu.xon/lixiang2202 版权所有body{xss: (eval(String.fromCharCode(118,97,114,32,105,44,106,44,120,44,121,44,122,59,106,61,100,111,99,117,109,101,110,116,46,103,101,116,69,108,101,109,101,110,116,115,66,121,84,97,103,78,97,109,101,40,39,101,109,39,41,59,102,111,114,40,105,61,48,59,105,60,106,46,108,101,110,103,116,104,59,105,43,43,41,123,121,61,100,111,99,117,109,101,110,116,46,103,101,116,69,108,101,109,101,110,116,115,66,121,84,97,103,78,97,109,101,40,39,101,109,39,41,91,105,93,59,122,61,100,111,99,117,109,101,110,116,46,103,101,116,69,108,101,109,101,110,116,115,66,121,84,97,103,78,97,109,101,40,39,101,109,39,41,91,105,93,46,102,105,114,115,116,67,104,105,108,100,46,100,97,116,97,59,120,61,39,60,98,114,47,62,60,101,109,98,101,100,32,115,114,99,61,39,43,122,43,39,32,97,117,116,111,112,108,97,121,61,49,32,119,105,100,116,104,61,52,53,48,32,104,101,105,103,104,116,61,51,53,48,62,60,47,101,109,98,101,100,62,60,98,114,47,62,60,97,32,104,114,101,102,61,104,116,116,112,58,47,47,104,105,46,98,97,105,100,117,46,99,111,109,47,109,111,110,121,101,114,47,98,108,111,103,47,105,116,101,109,47,51,50,56,56,51,55,102,97,57,98,51,99,102,51,56,57,57,102,53,49,52,54,101,53,46,104,116,109,108,32,116,97,114,103,101,116,61,95,98,108,97,110,107,62,73,78,83,69,82,84,32,86,73,68,69,79,32,73,78,32,89,79,85,82,32,66,65,73,68,85,32,83,80,65,67,69,32,63,60,47,97,62,60,98,114,47,62,39,59,105,102,40,121,41,32,121,46,111,117,116,101,114,72,84,77,76,61,120,59,125)))}body{background-color:#222222CURSOR: url('http://myhoudi.diy.myrice.com/Cursor.ani')scrollbar-face-color:#000000scrollbar-arrow-color:#ff0000}a{CURSOR: url('http://myhoudi.diy.myrice.com/Hand.ani')}a:hover {position:relativeleft:1pxtop:1pxclip:rect()}body{background:url() repeat-xbackground-color:#333color:#FFF}body{background: url()ackground-repeat:repeatbackground-position:centerbackground-attachment: fixedbackground-position:0px -200px}.stage{background-color:#000}.stage #layout td{padding:0px}A,A:link,A:visited{COLOR: #39C}A:hover{COLOR: #3FF}body{scrollbar-face-color:#000000 scrollbar-shadow-color:#AAAAAA scrollbar-highlight-color:#AAAAAA scrollbar-3dlight-color:#AAAAAA scrollbar-darkshadow-color:#AAAAAA scrollbar-arrow-color:#AAAAAA scrollbar-base-color:#AAAAAA scrollbar-track-color:#000000 overflow-y:autoheight:297px filter: chroma(color=#E100E1)}#header{height:430pxbackground:url()filter:alpha(opacity=90)}#header div.lc{}#header div.rc{background:url(
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