JavaScript 模拟键盘事件和鼠标事件（比如模拟按下回车等）

http://blog.****.net/lovelyelfpop/article/details/52471878#

封装好的function大概就是这样:

function fireKeyEvent(el, evtType, keyCode){
var doc = el.ownerDocument,
win = doc.defaultView || doc.parentWindow,
evtObj;
if(doc.createEvent){
if(win.KeyEvent) {
evtObj = doc.createEvent('KeyEvents');
evtObj.initKeyEvent( evtType, true, true, win, false, false, false, false, keyCode, 0 );
}
else {
evtObj = doc.createEvent('UIEvents');
Object.defineProperty(evtObj, 'keyCode', {
get : function() { return this.keyCodeVal; }
});
Object.defineProperty(evtObj, 'which', {
get : function() { return this.keyCodeVal; }
});
evtObj.initUIEvent( evtType, true, true, win, 1 );
evtObj.keyCodeVal = keyCode;
if (evtObj.keyCode !== keyCode) {
console.log("keyCode " + evtObj.keyCode + " 和 (" + evtObj.which + ") 不匹配");
}
}
el.dispatchEvent(evtObj);
}
else if(doc.createEventObject){
evtObj = doc.createEventObject();
evtObj.keyCode = keyCode;
el.fireEvent('on' + evtType, evtObj);
}
}

使用方法：假设模拟回车