本文主要是介绍用html+javascript打造公文一键排版系统2：显示源码/显示预览、清除格式，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
我们从实现最简单、最基本的功能开始。
一、显示源码/显示预览
我们通过btnShowSrc来实现示源码/显示预览功能，根据btnShowSrc.value来判断<iframe>的显示的内容并切换。
<iframe>默认为显示预览，所以btnShowSrc.value值为“显示源码”，点击它后，<iframe>就显示源码，并将按钮的value改为“显示预览” 。代码如下：
function showSrc()
{if (btnShowSrc.value=="显示源码"){edRichBody.innerText = edRichBody.innerHTML;btnShowSrc.value = "显示预览";btnShowSrc.style.background = "cyan";}else{edRichBody.innerHTML = edRichBody.innerText;btnShowSrc.value = "显示源码";btnShowSrc.style.background = "yellow";}
}二、清除格式
我们要处理的公文可能是从word等文字处理程序复制过来的，本身带有一些格式，比如：
SQL注入基础
一、SQL注入分类
（一）什么是SQL注入?
SLQ注入(英文: Sqlinject)：当web应用向后台数据库传递SQL语句进行数据库操作时，如果对用户输入的参数没有经过严格的过滤，那么用户可以构造特殊的sq1语句，从而带入到数据库中执行，获取或修改数据库中的数据。
例如很多影视网站泄露VIP会员密码大多就是通过SQL注入漏洞暴露的，这类网站特别容易受到SQL注入攻击。
其源码是这样的：
<p></p><p class="MsoNormal"><p class="MsoNormal" align="center" style="text-align:center"><span lang="EN-US" style="font-family:黑体">SQL</span><span style="font-family:黑体">注入基础<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:黑体">一、<span lang="EN-US">SQL</span>注入分类<span lang="EN-US"><o:p></o:p></span></span></p>
<p class="MsoNormal" style="text-indent:21.1pt;mso-char-indent-count:2.0"><b style="mso-bidi-font-weight:normal"><span style="font-family:楷体">（一）什么是<span lang="EN-US">SQL</span>注入<span lang="EN-US">?<o:p></o:p></span></span></b></p>
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">SLQ</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">注入</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">英文</span><span lang="EN-US">: Sqlinject)</span><span style="font-family:宋体;mso-ascii-font-family:
Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">：当</span><span lang="EN-US">web</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">应用向后台数据库传递</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">语句进行数据库操作时，如果对用户输入的参数没有经过严格的过滤，那么用户可以构造特殊的</span><span lang="EN-US">sq1</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">语句，从而带入到数据库中执行，获取或修改数据库中的数据。</span><span lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:
Calibri;mso-hansi-theme-font:minor-latin">例如很多影视网站泄露</span><span lang="EN-US">VIP</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:
Calibri;mso-hansi-theme-font:minor-latin">会员密码大多就是通过</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;
mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:
Calibri;mso-hansi-theme-font:minor-latin">注入漏洞暴露的，这类网站特别容易受到</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;
mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:
minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">注入攻击。</span><span lang="EN-US"><o:p></o:p></span></p><br></p>
这些格式将影响排版的效果，所以我们用“清除格式”按钮调用自定义函数clearDocFmt()来清除这些格式。
我们需要先保留公文的分段信息，在html代码中分段一般是通过<p></p>这一对标签来定义的，所以我们要保留<P>这个标签的信息，但是<P>中一般还带有属性：
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0">
所以我们不能直接使用<p>，而是用“<p”。
先用字符串的split方法按'<p'将公文内容按段分解成一个数组，然后逐段进行处理：
1.用数组shift方法移除公文首部多余的空行
2.用数组的pop方法移除公文尾部多余的空行
3.用自定义函数stripPattribs移除<p>标签的相关属性。
4.用正则表达式为字符串对象构造stripHTML方法去除多余的html代码
5.用正则表达式为字符串对象构造trim方法去除首尾两端的多余空格
6.用replace方法去除 表示的空格
7.再次用数组的pop方法移除公文尾部多余的空行
8.利用数组的join()方法把处理好的各段信息连接起来。
相关代码如下：
function getClearInfoArray()
{var s = edRichBody.innerHTML;var t = s.split('<p');taDbg.value += "\n---getClearInfoArray()\n";for (var i=0; i < t.length; i++){taDbg.value += "\nt[" + i + "]=" + t[i];} while (t[0].length==0 || t[0]=='></p>'){taDbg.value += "\nshift: " + t[0];t.shift();}while (t[t.length-1].length==0 || t[t.length-1]=='></p>'){taDbg.value += "\npop: " + t[t.length-1];t.pop();}for (var i=0; i < t.length; i++){t[i] = stripPattribs(t[i]);t[i] = t[i].stripHTML();t[i] = t[i].trim(); //去除首尾空格t[i] = t[i].replace(/ /ig, ''); //去除空格代码 }while (t[t.length-1].length==0 || t[t.length-1]=='></p>'){taDbg.value += "\npop: " + t[t.length-1];t.pop();}taDbg.value += "\n---\n";for (var i=0; i < t.length; i++){taDbg.value += "\nt[" + i + "]=" + t[i];} return t;
}function clearDocFmt()
{var s = '<p>' + getClearInfoArray().join('</p><p>');edRichBody.innerHTML = s;
} 代码运行的效果如下图：
完整的代码如下：
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>公文一键排版</title>
<meta name="author" content="purpleendurer" >
<meta name="description" content="公文一键排版">
<script type="text/javascript">
const aFontName = ["方正小标宋简体",//0"黑体",//1"微软雅黑",//2"仿宋_GB2312",//3"仿宋",//4"楷体_GB2312",//5"楷体",//6"宋体",//7"Arial",//8"Wingdings 2"//9
];//sId:select control id, iDefSel:default selected
function showFontNameSel(sId, iDefSel)
{document.write('<select id="', sId, '" width="50">');for (var i = 0; i < aFontName.length; i++){document.write('<option value="', aFontName[i], '"');document.write(i==iDefSel ? ' selected>' : '>');document.write(aFontName[i],'</option>');}document.write('</select>');
}
const aFontSize = [['初号', 42],//0['小初', 36],//1['一号', 26],//2['小一', 24],//3['二号', 22],//4['小二', 18],//5['三号', 16],//6['小三', 15],//7['四号', 14],//8['小四', 12],//9['五号', 10.5], //10['小五', 9],//11['六号', 7.5],//12['小六', 6.5],//13['七号', 5.5],//14['八号', 5]//15
];//sId:select control id, iDefSel:default selected
function showFontSizeSel(sId, iDefSel)
{document.write('<select id="', sId, '">');for (var i = 0; i < aFontSize.length; i++){document.write('<option value="',aFontSize[i][1], '"');document.write(i==iDefSel ? ' selected>' : '>');document.write(aFontSize[i][0],'</option>');}document.write('</select>');
}const aAlign = [["左对齐","left"],//0["居中对齐","center"],//1["右对齐","right"],//2["两端分散对齐","justify"]//3
];//sId:select control id, iDefSel:default selected
function showAlignSel(sId, iDefSel)
{document.write('<select id="', sId, '">');for (var i = 0; i < aAlign.length; i++){document.write('<option value="',aAlign[i][1], '"');document.write(i==iDefSel ? ' selected>' : '>');document.write(aAlign[i][0],'</option>');}document.write('</select>');
}function showSrc()
{if (btnShowSrc.value=="显示源码"){edRichBody.innerText = edRichBody.innerHTML;btnShowSrc.value = "显示预览";btnShowSrc.style.background = "cyan";}else{edRichBody.innerHTML = edRichBody.innerText;btnShowSrc.value = "显示源码";btnShowSrc.style.background = "yellow";}
}function stripPattribs(s)
{var i = s.indexOf('>');return ((-1 != i) ? s.substr(i+1) : s);
}String.prototype.stripHTML = function()
{var reTag = /<(?:.|\s)*?>/g; //var reTag = /<[^>]+>/gi; //过滤所有html标签，但不包括html标签内的内容 return this.replace(reTag,"");
}String.prototype.trim = function()
{//去除首尾空格return this.replace(/(^\s*)|(\s*$)/g, ""); /*var t = this.replace(/(^\s*)|(\s*$)/g, ""); return t =t.replace(/(^ *)|( *$)/g, ""); */
} function getClearInfoArray()
{var s = edRichBody.innerHTML;var t = s.split('<p');taDbg.value += "\n---getClearInfoArray()\n";for (var i=0; i < t.length; i++){taDbg.value += "\nt[" + i + "]=" + t[i];} while (t[0].length==0 || t[0]=='></p>'){taDbg.value += "\nshift: " + t[0];t.shift();}while (t[t.length-1].length==0 || t[t.length-1]=='></p>'){taDbg.value += "\npop: " + t[t.length-1];t.pop();}for (var i=0; i < t.length; i++){t[i] = stripPattribs(t[i]);t[i] = t[i].stripHTML();t[i] = t[i].trim(); //去除首尾空格t[i] = t[i].replace(/ /ig, ''); //去除空格代码 }while (t[t.length-1].length==0 || t[t.length-1]=='></p>'){taDbg.value += "\npop: " + t[t.length-1];t.pop();}taDbg.value += "\n---\n";for (var i=0; i < t.length; i++){taDbg.value += "\nt[" + i + "]=" + t[i];} return t;
}function clearDocFmt()
{var s = '<p>' + getClearInfoArray().join('</p><p>');edRichBody.innerHTML = s;
} </script>
</head>
<body>
<fieldset style="width: 1100px;"><legend>实时编辑区</legend>
<!--
<iframe id="editor" width="600px" height="200px" style="border: solid 1px;" src="http://nyncj.hechi.gov.cn"></iframe>
//-->
<iframe id="editor" width="1200px" height="400px" style="border: solid 1px;"></iframe>
</fieldset>
<p><input type="button" id="btnclearDocFmt" value="清除格式" onclick="clearDocFmt()" /><input type="button" id="btnsetDocFmt" value="一键排版" onclick="setDocFmt()" /><input type="button" id="btnShowSrc" value="显示源码" onclick="showSrc()" style="background:yellow; border-radius: 25px;" /><input type="button" id="btnB" value="B" title="加粗/正常" style="font-weight:bolder" onclick="execCmd('bold',false,null)" /><input type="button" id="btnItalic" value="I" title="斜体/正常" style="font-weight:bolder;font-style:italic" onclick="execCmd('italic',false,null)" />
</p>
<fieldset style="width: 1200px;"><legend>参数设置</legend><p>文件标题：<script>showFontNameSel("selDocTitleFontName", 0);document.write(' ');showFontSizeSel("selDocTitleFontSize", 4);document.write(' ');showAlignSel("selDocTitleAlign", 1);</script><p>一级标题：<script>showFontNameSel("selPrimaryTitleFontName", 1);document.write(' ');showFontSizeSel("selPrimaryTitleFontSize", 6);</script></p><p>二级标题：<script>showFontNameSel("selSecondaryTitleFontName", 5);document.write(' ');showFontSizeSel("selSecondaryTitleFontSize", 6);</script><input type="checkbox" checked id="cbSecondaryTitleString">粗体</p><p>三级标题：<input type="checkbox" checked id="cbThirdTitleString">粗体</p><p>行距（行间距）：<input type="text" id="tbRowSp" value="28" size="2"><!-- row spacing//--> 段落首行行首空格数：<input type="text" id="tbLeadSpNum" value="2" size="2"></P></fieldset>
<p>调试信息</p>
<textarea id="taDbg" style="width: 1225px; height: 200px">调试信息</textarea>
<script type="text/javascript">
const edRich = document.getElementById("editor");
const taDbg = document.getElementById("taDbg");
const btnShowSrc = document.getElementById("btnShowSrc");
//一级标题字号 font name
var pt1fn = document.getElementById('selPrimaryTitleFontName').value;
//一级标题字号 font size
var pt1fs = document.getElementById('selPrimaryTitleFontSize').value;
//alert(fs);
//行距 row spacingvar rs = document.getElementById('tbRowSp').value;
//首行行首空格数var sn = document.getElementById('tbLeadSpNum').value;
// (iframe.contentDocument||iframe.contentWindow.document).body.innerHTML
var edRichDoc;
var edRichBody;
if (typeof(edRich) !="undefined"){edRichDoc = edRich.contentWindow.document;edRichDoc.designMode = "on";edRichDoc.contentEditable = true;edRichBody = edRichDoc.body;edRichBody.innerHTML = '<p><a href="http://blog.csdn.net/purpleendurer">http://blog.csdn.net/purpleendurer</a></p><p></p><p class="MsoNormal"><p class="MsoNormal" align="center" style="text-align:center"><span lang="EN-US" style="font-family:黑体">SQL</span><span style="font-family:黑体">注入基础<span lang="EN-US"><o:p></o:p></span></span></p><p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:黑体">一、<span lang="EN-US">SQL</span>注入分类<span lang="EN-US"><o:p></o:p></span></span></p><p class="MsoNormal" style="text-indent:21.1pt;mso-char-indent-count:2.0"><b style="mso-bidi-font-weight:normal"><span style="font-family:楷体">（一）什么是<span lang="EN-US">SQL</span>注入<span lang="EN-US">?<o:p></o:p></span></span></b></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span lang="EN-US">SLQ</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">注入</span><span lang="EN-US">(</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">英文</span><span lang="EN-US">: Sqlinject)</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">：当</span><span lang="EN-US">web</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">应用向后台数据库传递</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">语句进行数据库操作时，如果对用户输入的参数没有经过严格的过滤，那么用户可以构造特殊的</span><span lang="EN-US">sq1</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">语句，从而带入到数据库中执行，获取或修改数据库中的数据。</span><span lang="EN-US"><o:p></o:p></span></p><p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">例如很多影视网站泄露</span><span lang="EN-US">VIP</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">会员密码大多就是通过</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">注入漏洞暴露的，这类网站特别容易受到</span><span lang="EN-US">SQL</span><span style="font-family:宋体;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:宋体;mso-fareast-theme-font:minor-fareast;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin">注入攻击。</span><span lang="EN-US"><o:p></o:p></span></p><br></p>';
}
else
{window.alert("undefined");
}
</script>
</body>
</html>
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