可编辑的div元素去除粘贴复制带来的额外样式，实现纯文本粘贴

$(function(){

var update = function(original){
   var new_content = $('.testmr').html();
   
   var new_content = new_content.replace(/class="[^"]+"/ig, '');
  
   new_content = new_content.replace(/class\="[^"]+"/gi, '');
  
   new_content = new_content.replace(/<h1.*?>(.*?)<\/h1>/ig,"$1");
   
   new_content = new_content.replace(/<h2.*?>(.*?)<\/h2>/ig,"$1");
   
   new_content = new_content.replace(/<h3.*?>(.*?)<\/h3>/ig,"$1");
   
   new_content = new_content.replace(/<h4.*?>(.*?)<\/h4>/ig,"$1");
   
   new_content = new_content.replace(/<h5.*?>(.*?)<\/h5>/ig,"$1");
   
   new_content = new_content.replace(/<h6.*?>(.*?)<\/h6>/ig,"$1");
   
   new_content = new_content.replace(/style\="[^"]+"/gi, '');
  
   alert(new_content);
  $('.testmr').html(new_content);
  } 
   
  $('.testmr').bind('paste',function(e){
   var $this = $(this); 
   var original = $this.html();
   setTimeout(function(){update();}, 10);
   
    })
  })