js在一个可编辑的div光标处插入图片或者文本（兼容ie，火狐等浏览器）

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>在一个可编辑的div光标处插入图片或者文本</title>
</head>

<body>
<div style="width:500px; margin:20px auto; height:200px; border:1px solid red" contenteditable="true" id="reditor"></div>
<button  id="contenteditable">插入图片</button>
</body>
</html>
<script>

window.onload=function(){    
        
        document.getElementById("contenteditable").onclick=function(){    
            Manager.insertImg();

};
}

var Manager = {
            insertHtml:function(html,type){
            
            var lastMemo=document.getElementById("memo"),lastEditor=document.getElementById("reditor");

type=type||'memo';

var control=type=='memo'?lastMemo:lastEditor;

if(!control)return;

control.focus();

var selection=window.getSelection?window.getSelection():document.selection,

range=selection.createRange?selection.createRange():selection.getRangeAt(0);

//判断浏览器是ie，但不是ie9以上
            var browser = checkBrowser().split(":");
            var IEbrowser = checkBrowser().split(":")[0];
            var IEverson =  Number(checkBrowser().split(":")[1]);
            
            if(IEbrowser=="IE"&&IEverson<9){

range.pasteHTML(html);

}else{

var node=document.createElement('span');

node.innerHTML=html;

range.insertNode(node);

selection.addRange(range);

}

},

insertImg:function(){
                var img="<img src='http://www.baidu.com/img/bdlogo.gif'/>";
                this.insertHtml(img,'editor');
        }

}

function checkBrowser()
{
 var browserName=navigator.userAgent.toLowerCase();
 //var ua = navigator.userAgent.toLowerCase();
 var Sys = {};
 var rtn = false;
 
    if(/msie/i.test(browserName) && !/opera/.test(browserName)){
        strBrowser = "IE: "+browserName.match(/msie ([\d.]+)/)[1];
  rtn = true;
        //return true;
    }else if(/firefox/i.test(browserName)){
        strBrowser = "Firefox: " + browserName.match(/firefox\/([\d.]+)/)[1];;
        //return false;
    }else if(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName)){
        strBrowser = "Chrome: " + browserName.match(/chrome\/([\d.]+)/)[1];
        //return false;
    }else if(/opera/i.test(browserName)){
        strBrowser = "Opera: " + browserName.match(/opera.([\d.]+)/)[1];
        //return false;
    }else if(/webkit/i.test(browserName) &&!(/chrome/i.test(browserName) && /webkit/i.test(browserName) && /mozilla/i.test(browserName))){
        strBrowser = "Safari: ";
        //return false;
    }else{
        strBrowser = "unKnow,未知浏览器 ";
  //return false;
    }
 strBrowser = strBrowser ;
 //alert(strBrowser)
 return strBrowser;
}

</script>