openlayers 注册事件例子

 registerEvents:function() {
    this.events = new OpenLayers.Events(this, this.div, null, true);

    function onTouchstart(evt) {
        OpenLayers.Event.stop(evt, true);
    }
    this.events.on({
        "mousedown": this.onmousedown,
        "mousemove": this.onmousemove,
        "mouseup": this.onmouseup,
        "click": this.onclick,
        "mouseout": this.onmouseout,
        "dblclick": this.ondblclick,
        "touchstart": onTouchstart,
        scope: this
    });
    
 },

/** 
 * Method: onmousedown 
 * When mouse goes down within the popup, make a note of
 *   it locally, and then do not propagate the mousedown 
 *   (but do so safely so that user can select text inside)
 * 
 * Parameters:
 * evt - {Event} 
 */
onmousedown: function (evt) {
    this.mousedown = true;
    OpenLayers.Event.stop(evt, true);
},