JS基础学习4：绑定事件

JS基础学习四：绑定事件
添加事件
IE: attachEvent
Other: addEventListener

var button = document.getElementById("buttonId");
if(button.addEventListener){
    button.addEventListener("click",eventFunction,false);
}else if(button.attachEvent){
    button.attachEvent("onclick",eventFunction);
}

删除事件
IE: detachEvent
Other: removeEventListener

事件冒泡机制
IE: 事件从它发生的地方被触发，然后向DOM结构的上层冒泡
Other: 事件先向下沉入到目标元素，再向上冒泡
     addEventListener( , ,[true|false])

• true: 向下沉入时截获事件
• false: 向上冒泡时截获事件

停止事件冒泡:
IE: window.event.cancelBubble=false;
Other: e.stopPropagation();

实验的例子：

function bindEvent() {
	var button = document.getElementById("buttonId");
	if (button.addEventListener) {
		alert("Other browser");
		//button.addEventListener("click",showEvent,false);
		//button.addEventListener("click",showEvent2,false);
		button.addEventListener("click", showEvent, true);
		button.addEventListener("click", showEvent2, true);
	} else if (button.attachEvent) {
		alert("IE browser");
		button.attachEvent("onclick", showEvent);
		button.attachEvent("onclick", showEvent2);
	}
}

function removeEvent() {
	var button = document.getElementById("buttonId");
	if (button.removeEventListener) {
		alert("Other browser");
		//button.removeEventListener("click",showEvent,false);
		button.removeEventListener("click", showEvent, true);
	} else if (button.detachEvent) {
		alert("IE browser");
		button.detachEvent("onclick", showEvent);
	}
}

function showEvent(e) {
	if (window.event != undefined) {
		window.event.cancelBubble = true;
	} else if (e.stopPropagation) {
		e.stopPropagation();
	}
	alert("Event here!");
}

function showEvent2() {
	alert("Other event here!");
}

function divEvent() {
	alert("Div Event");
}

<div onclick="divEvent()">
    <input type="button" id="buttonId" value="showEvent"/>
</div>

键盘事件

window.onload=function(){
     //绑定键盘事件
     document.onkeydown=showkey;
}

function showkey(e){
     var key;
     if(window.event)
          key= window.event.keyCode;
     else
          key= e.keyCode;

     alert(String.fromCharCode(key));
}

鼠标事件
获取mouse的位置
IE: clientX,clientY
Other: pageX, pageY

document.onmouseover= showPosition;