1 var text = document.getElementById('demo');
2 var count = document.getElementById('count');
3 var handle = function(){
4 var evt = window.event || arguments.callee.caller.arguments[0];
5 //evt.target 不支持ie10及以下浏览器 || evt.srcElement 不支持火狐浏览器
6 var src = evt.target || evt.srcElement;
7 count.innerText = src.value.length;
8 }
9 if(text.addEventListener){
10 text.addEventListener('input',handle,false);
11 }else if(text.attachEvent){
12 text.attachEvent('onpropertychange',handle);
13 }else{
14 text['onpropertychange'] = handle;
15 }
