JavaScript处理不同浏览器的鼠标点击事件

JavaScript处理不同浏览器的鼠标点击事件

// Browser detection
 
var ie=document.all != null;  //ie4
var op7=navigator.userAgent.indexOf("opera")>0 && operaVersion() <= 7;
 
function operaVersion() {
	agent = navigator.userAgent;
	idx = agent.indexOf("opera");	
	if (idx>-1) {
		return parseInt(agent.subString(idx+6,idx+7));
	}
}
 
 
/* Detection of the mouse button
 
    		L M R
IE,KON		1 4 2  event.button   
NS,OP8,FF	0 1 2  e.button
OP7 		1 3 2  e.button
NS,OP8,FF	1 2 3  e.which
*/
 
var leftButton   = ie? 1 : 0; // op7 supports document.all
var middleButton = op7 ? 3 : ie ? 4 : 1;
var rightButton  = 2;
 
document.onmouseup = onClick;
 
// This code is executed each time a mouse button is released
function onClick(e) {
	if (ie) {
		var elem = event.srcElement;
		var btn  = event.button;
		//e = event;
	} else {
		var elem = e.target;
		var btn  = e.button;
	}
	// elem is the element the user clicked on 
	// btn is the mouse button which was used
	// e.g. if (btn == leftButton) { alert( elem + ": You clicked me!" ); }
 
	/* ...your code goes here... */
 
	return false;
}