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var isIE = (function(){
    var v = 3,
        div = document.createElement('div'),
        all = div.getElementsByTagName('i');
    //通过IE检测HTML条件注释方式
    //循环判断IE浏览器当前支持版本
    while (
        div.innerHTML = '<!--[if gt IE ' + (++v) + ']><i></i><![endif]-->',
        all[0]
    );

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//计算字符串长度，中文按2
function getStringLen(str) {
    var cArr = str.match(/[^\x00-\xff]/ig);
    return str.length + (cArr == null ? 0 : cArr.length);
}

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keycode 8 = BackSpace BackSpace
keycode 9 = Tab Tab
keycode 12 = Clear
keycode 13 = Enter
keycode 16 = Shift_L
keycode 17 = Control_L
keycode 18 = Alt_L
keycode 19 = Pause
keycode 20 = Caps_Lock
keycode 27 = Escape Escape

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function createIframe(fname){
    if(!fname || typeof fname !== 'string'){
        return document.createElement('iframe');
    }
    var ifr = null;
    try{
        ifr = document.createElement('<iframe name=' + fname + '></iframe>');
    }catch(e){
        ifr = document.createElement('iframe');
        ifr.name = fname;

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// copied from quora answer by David-Calhoun
// https://www.quora.com/David-Calhoun 
if (document.addEventListener) { // standard

  document.addEventListener('click', function onclick(e) {
    var r;
    if (document.caretRangeFromPoint) { // standard (WebKit)
      r = document.caretRangeFromPoint(e.pageX, e.pageY);
    } else if (e.rangeParent) { // Mozilla
      r = document.createRange();

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function parseURL(url) {
    var a = document.createElement('a');
    a.href = url;
    return {
        source: url,
        protocol: a.protocol.replace(':',''),
        host: a.hostname,
        port: a.port,
        query: a.search,
        params: (function(){

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mouseenter事件在鼠标进入某个元素，或第一次进入这个元素的某个子元素时触发。一旦触发后，在mouseleave之前，鼠标在这个元素的子元素上触发mouseenter事件都不会触发这个元素的mouseenter事件。即：一旦进入，在子元素间的mouseenter不算是在本元素上的mouseenter。

而mouseover事件是必然冒泡的，一旦子元素mouseover了，本元素必然mouseover（除非子元素上禁止冒泡了）。

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function wheelHandle(e) { 
    if(e.wheelDelta) {// IE, KHTML, Opera 
        alert(e.wheelDelta > 0 ? '向上滚' : '向下滚'); 
    } else { // Gecko 
        alert(e.detail < 0 ? '向上滚' : '向下滚'); 
    } 
} 

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document.addEventListener('eventName', function(){
    var win = window.open();
    win.document.write('<h1>test open window</h1>');    // write content in new opened window
    win.document.close();
}, false);

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    cdm→  componentDidMount: fn() { ... }

   cdup→  componentDidUpdate: fn(pp, ps) { ... }

     cs→  var cx = React.addons.classSet;

    cwm→  componentWillMount: fn() { ... }

    cwr→  componentWillReceiveProps: fn(np) { ... }