阻止默认事件

//var eles=document.getElementsByTagName('*')
//function fn(e){
// alert(this.tagName)
// e||window.event;
// if(e.stopProgration){
//  e.stopProgration()
//  }else{
//   e.cancelBubble=true;
//   }
// }
//for(var i=0;i<eles.length;i++){
// eles.item(i).onclick=fn;
// 
// }
 
//document.onclick=function(e){
//  e||window.event;
//  var target=e.target||e.srcElement;
//  alert(target.nodeName)
// }