iframe标红，不影响原来字体

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我是靠谱客的博主称心荔枝，最近开发中收集的这篇文章主要介绍iframe标红，不影响原来字体，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<style type="text/css">
p{width:600px;text-align: left;text-indent:2em;line-height:20px;font-size:12px}
textarea{width:600px;height:100px;font-size:12px;overflow:auto}
</style>
</head>
<body>
<span style="display:block;height:150px; font-size:12px;line-height:150%">信息</span>
<div id="J_tool">
<input type="button" command="true" value="撤销" unselectable="on" />
<input type="button" command="Redo" value="重做" unselectable="on" />
<input type="button" command="Bold" value="粗体" unselectable="on" />
<input type="button" command="false" value="标红" unselectable="on" />
</div>
<br />
<script type="text/javascript">
function changeLayout(){
var popwin = document.getElementById('popwin');
if(!popwin){
popwin = document.createElement('div');
popwin.id = 'popwin';
popwin.style.cssText = 'display:none;width:300px;height:150px;background-color:#ccc;position:absolute;left:0;top:0px;text-align:center;line-height:150px;';
document.body.appendChild(popwin);
popwin.οnclick= function(){this.style.display = 'none'};
}
popwin.style.display = popwin.style.display == 'none' ? 'block' : 'none';
}
function createEditor(){
var iframe = document.createElement('iframe');
iframe.id = 'iframe';
iframe.frameBorder = 1;
iframe.width = 400;
iframe.height = 200;
document.body.appendChild(iframe);
return iframe;
}
var bind = function(element,eventType,fn,useCapture){
useCapture = useCapture || false;
if(arguments.length < 3){
return true
};
if(window.addEventListener){
element.addEventListener(eventType, fn, useCapture);
}else{
element.attachEvent('on'+eventType,fn, useCapture);
}
}
//from 司徒正美
var css = document.defaultView ? function(el,style){
return document.defaultView.getComputedStyle(el, null).getPropertyValue(style)
} : function(el,style){
style = style.replace(/-(w)/g, function($, $1){
return $1.toUpperCase();
});
return el.currentStyle[style];
}
function bindEditor(){
var iframe = createEditor();
var ifr_win = iframe.contentWindow;
var ifr_doc = ifr_win.document;
var editorContent = '<span style="font-family: 宋体;">阿四大四大圣达菲的地方地方地方发的地方地方地方发的地方地方地方地方地方地方高投入过投放后翻译好衣服四</span>';
ifr_doc.designMode='On';//可编辑
ifr_doc.contentEditable = true;
ifr_doc.open();
ifr_doc.writeln('<html><head><style type="text/css">body{padding:10px;margin:0;font-size:13px;font-family:宋体;text-align:left;overflow:auto;word-wrap: break-word;cursor:text;background-color: transparent; }body,p,font,div,ul,li {line-height: 1.5;}p,font,div,ul,li {line-height: 1.5;margin:0;padding:0}a{color:#548DD4}</style></head><body>'+ editorContent +'</body></html>');
ifr_doc.close();
var getRange = function(){
var range = window.getSelection ? ifr_win.getSelection() : ifr_win.document.selection;
if (!range) {
return {
node : null,
range : null,
text : null
};
}
range = range.createRange ? range.createRange() : range.getRangeAt(0);
var text = window.getSelection ? range : range.text;
var rangeNode = null;
if (range.commonAncestorContainer) {
rangeNode = range.commonAncestorContainer;
} else {
if (range.parentElement) rangeNode = range.parentElement();
}
return {
node : rangeNode,
range : range,
text : text
}
}
var info = document.getElementsByTagName('span')[0];
var getStyle = function(node){
//console.log(node)
var html = '';
html+= '<span style="font-family:'+ css(node,'font-family') +'">字体:'+ css(node,'font-family') + '</span><br />';
html+= '<span style="color:'+ css(node,'color') +'">颜色：'+ css(node,'color') + '</span><br />';
html+= '<span style="font-style:'+ css(node,'font-style') +'">斜体：'+ css(node,'font-style') + '</span><br />';
html+= '<span style="font-weight:'+ css(node,'font-weight') +'">粗体：'+ css(node,'font-weight') + '</span><br />';
html+= '<span style="text-decoration:'+ css(node,'text-decoration') +'">下划线：'+ css(node,'text-decoration') + '</span><br />';
html+= 'tagName:'+ node.tagName + ',style:'+ node.getAttribute('style') +'<br />';
info.innerHTML = html;
}
//当光标位置改变时候执行
var onselectionchange = function(event){
var e = event || window.event;
if(!e.keyCode)e.keyCode = e.which;
//方向键移动光标,获取光标位置的dom
if((e.keyCode >= 37 && e.keyCode <= 40 )|| e.type == "click"){
var node = getRange().node;//获取光标位置元素
if(node !== null){
while(node.nodeType != 1){
node = node.parentNode;
}
if(node != "font"){
ifr_doc.execCommand('ForeColor',false,'#ff0000');
}
getStyle(node);
}
}
}
bind(ifr_doc,'click',onselectionchange,false);
bind(ifr_doc,'keydown',onselectionchange,false);
bind(document.getElementById('J_tool'),'click',function(event){
event = event || window.event;
var target = event.srcElement || event.target;
var command = target.getAttribute('command');
ifr_doc.execCommand('ForeColor',false,'#ff0000');
return false;
})
}
window.onload = function(){
bindEditor();
}
</script>
</body>
</html>