js简单的文本编辑器（所见即所得）
<div id="cnblogs_post_body"><div class="cnblogs_code"><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=gbk"><title>简单文本编辑器</title></head><body> <div style="width: 450px; height: 30px; border-top: 1px solid; border-left: 1px solid; border-right: 1px solid;"> <select onchange=document.execCommand('FontSize',false,this.value)> <option value=3>3号字</option> <option value=4>4号字</option> <option value=5>5号字</option> <option value=6>6号字</option> <option value=7>7号字</option> </select> <input type=button value="红色" onclick=document.execCommand('ForeColor',false,'#ff0000')> <input type=button value="绿色" onclick=document.execCommand('ForeColor',false,'#00ff00')> <input type=button value="蓝色" onclick=document.execCommand('ForeColor',false,'#0000ff')> <input type=button value="左对齐" onclick="document.execCommand('JustifyLeft')"> <input type=button value="居中" onclick=document.execCommand('JustifyCenter')> <input type=button value="右对齐" onclick=document.execCommand('JustifyRight')> </div> <div id="editArea" contenteditable style="height: 200px; width: 450px; border: 1px solid; overflow-y: auto;"> </div> <div align="center" style="width: 450px;"> <input type="button" value="&darr;" onclick='htmlsource.value=editArea.innerHTML;'> <input type="button" value="&uarr;" onclick='editArea.innerHTML=htmlsource.value;'> </div> <div> <textarea id="htmlsource" name="htmlsource" cols="62" rows="10"></textarea> </div></body></html>
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