var node = document.getElementsByTagName('button')[0]; //dom節點
if (MouseEvent) {
// Up-to-date approachvar mevt = new MouseEvent('click', {
view: window,
bubbles: false,
cancelable: true
});
node.dispatchEvent(mevt);
} else if ( document.createEvent ) {
// Fallback
var evt = document.createEvent('MouseEvents');
evt.initEvent('click', false, false);
node.dispatchEvent(evt);
} else if( document.createEventObject ) {
node.fireEvent('onclick') ;
} else if (typeof node.onclick === 'function' ) {
node.onclick();
}