关于微博的字数计算的问题？

最近想写一个类型微博的文本域，能实现字数计算的功能。发现用键盘事件可以实现，但是一旦使用鼠标右键在文本域粘贴后，字数就不能更新了。但是看到新浪、腾讯的输入框在用鼠标粘贴的时候，依旧能更新字数。
求高手指点一下思路，我觉得可以使用循环一直判断，不知道有没有更好的方法？

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

IE6,7,8绑定 propertychange 事件。
IE9绑定 keydown, cut, input 事件。(propertychange,input事件在IE9下有BUG)
其他浏览器绑定 input 事件。
例如你实现了兼容浏览器的事件绑定方法 addEvent ，那么针对IE外的浏览器这样绑定事件：
addEvent(node, 'input', function(evt){
   //do somthing
});由于事件的激发非常频繁，你还要设计一个事件缓存机制延迟并定时计算字数。
<script type="text/javascript">
function init(){
var a=document.getElementById("test");
a.onkeyup=count;
a.onmouseover=count;
a.onmouseout=count;
}
function count(){
var a=document.getElementById("test").value.length;
document.getElementById("div").innerHTML=a;
}
window.onload=init;
</script>
</head><body>
<textarea id="test"></textarea>
<div id="div"></div>
</body>这样试试
onchange onpaste 然后加上健盘事件
onpaste onpaste byteLength = function(b) {
if (typeof b == "undefined") {
return 0
}
var a = b.match(/[^\x00-\x80]/g);
return (b.length + (!a ? 0 : a.length))
}; return function(q, g) {
g = g || {};
g.max = g.max || 140;
g.min = g.min || 41;
g.surl = g.surl || 20;
var p = trim(q).length;
if (p > 0) {
var j = g.min,
s = g.max,
b = g.surl,
n = q;
var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\/\,\:;@&=\?~#%]*)*/gi) || [];
var h = 0;
for (var m = 0,
p = r.length; m < p; m++) {
var o = byteLength(r[m]);
if (/^(http:\/\/t.cn)/.test(r[m])) {
continue
} else {
if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
h += o <= j ? o: (o <= s ? b: (o - s + b))
} else {
h += o <= s ? b: (o - s + b)
}
}
n = n.replace(r[m], "")
}
return Math.ceil((h + byteLength(n)) / 2)byteLength = function(b) {
if (typeof b == "undefined") {
return 0
}
var a = b.match(/[^\x00-\x80]/g);
return (b.length + (!a ? 0 : a.length))
}; return function(q, g) {
g = g || {};
g.max = g.max || 140;
g.min = g.min || 41;
g.surl = g.surl || 20;
var p = trim(q).length;
if (p > 0) {
var j = g.min,
s = g.max,
b = g.surl,
n = q;
var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\/\,\:;@&=\?~#%]*)*/gi) || [];
var h = 0;
for (var m = 0,
p = r.length; m < p; m++) {
var o = byteLength(r[m]);
if (/^(http:\/\/t.cn)/.test(r[m])) {
continue
} else {
if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
h += o <= j ? o: (o <= s ? b: (o - s + b))
} else {
h += o <= s ? b: (o - s + b)
}
}
n = n.replace(r[m], "")
}
return Math.ceil((h + byteLength(n)) / 2)
} else {
return 0 byteLength = function(b) {
if (typeof b == "undefined") {
return 0
}
var a = b.match(/[^\x00-\x80]/g);
return (b.length + (!a ? 0 : a.length))
}; return function(q, g) {
g = g || {};
g.max = g.max || 140;
g.min = g.min || 41;
g.surl = g.surl || 20;
var p = trim(q).length;
if (p > 0) {
var j = g.min,
s = g.max,
b = g.surl,
n = q;
var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\/\,\:;@&=\?~#%]*)*/gi) || [];
var h = 0;
for (var m = 0,
p = r.length; m < p; m++) {
var o = byteLength(r[m]);
if (/^(http:\/\/t.cn)/.test(r[m])) {
continue
} else {
if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
h += o <= j ? o: (o <= s ? b: (o - s + b))
} else {
h += o <= s ? b: (o - s + b)
}
}
n = n.replace(r[m], "")
}
return Math.ceil((h + byteLength(n)) / 2)
} else {
return 0
} byteLength = function(b) {
if (typeof b == "undefined") {
return 0
}
var a = b.match(/[^\x00-\x80]/g);
return (b.length + (!a ? 0 : a.length))
}; return function(q, g) {
g = g || {};
g.max = g.max || 140;
g.min = g.min || 41;
g.surl = g.surl || 20;
var p = trim(q).length;
if (p > 0) {
var j = g.min,
s = g.max,
b = g.surl,
n = q;
var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\/\,\:;@&=\?~#%]*)*/gi) || [];
var h = 0;
for (var m = 0,
p = r.length; m < p; m++) {
var o = byteLength(r[m]);
if (/^(http:\/\/t.cn)/.test(r[m])) {
continue
} else {
if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
h += o <= j ? o: (o <= s ? b: (o - s + b))
} else {
h += o <= s ? b: (o - s + b)
}
}
n = n.replace(r[m], "")
}
return Math.ceil((h + byteLength(n)) / 2)
} else {
return 0
} byteLength = function(b) {
if (typeof b == "undefined") {
return 0
}
var a = b.match(/[^\x00-\x80]/g);
return (b.length + (!a ? 0 : a.length))
}; return function(q, g) {
g = g || {};
g.max = g.max || 140;
g.min = g.min || 41;
g.surl = g.surl || 20;
var p = trim(q).length;
if (p > 0) {
var j = g.min,
s = g.max,
b = g.surl,
n = q;
var r = q.match(/(http|https):\/\/[a-zA-Z0-9]+(\.[a-zA-Z0-9]+)+([-A-Z0-9a-z\$\.\+\!\_\*\/\,\:;@&=\?~#%]*)*/gi) || [];
var h = 0;
for (var m = 0,
p = r.length; m < p; m++) {
var o = byteLength(r[m]);
if (/^(http:\/\/t.cn)/.test(r[m])) {
continue
} else {
if (/^(http:\/\/)+(weibo.com|weibo.cn)/.test(r[m])) {
h += o <= j ? o: (o <= s ? b: (o - s + b))
} else {
h += o <= s ? b: (o - s + b)
}
}
n = n.replace(r[m], "")
}
return Math.ceil((h + byteLength(n)) / 2)
} else {
return 0
}
}
})(); 详细出处参考：http://www.jb51.net/article/28130.htm
}
})(); 详细出处参考：http://www.jb51.net/article/28130.htm
}
})(); 详细出处参考：http://www.jb51.net/article/28130.htm
}
}
})(); 详细出处参考：http://www.jb51.net/article/28130.htm
} else {
return 0
}
}
})(); 详细出处参考：http://www.jb51.net/article/28130.htm