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<style>
#a{
height: 100px;
width: 100px;
border: 1px solid black;
float: left;
margin-left: 200px;
text-align: center;
line-height: 100px;
}
#b{
height: 100px;
width: 100px;
line-height: 100px;
border: 1px solid black;
float: right;
margin-right: 200px;
text-align: center;
}
</style>
</head>
<body>
<div id="a"><img src="img/w3school_logo_black.gif" draggable="true"></div>
<div id="b"></div>
</body>
<script>
(function(){
})();
function $() {
var elements = new Array();
for (var i = arguments.length - 1; i >= 0; i--) {
var element = arguments[i];
if (typeof element == "string") {
element = document.getElementById(element);
}
if (arguments.length == 1) {
return element;
} else {
elements.push(element);
}
return elements;
};
};
//封装事件处理
function addEvent(node, type, listener) {
if (!(node = $(node))) return false;
if (node.addEventListener) {
//W3C
node.addEventListener(type, listener, false);
return true;
} else if (node.attachEvent) {
node[‘e‘ + type + listener] = listener;
node[type + listener] = function() {
node[‘e‘ + type + listener](window.event);
};
node.attachEvent(‘on‘ + type, node[type + listener]);
return true;
}
return false;
};
//移出事件
function removeEvent(node,type,listener){
if (!(node = $(node))) return false;
if(node.removeEventListener){
node.removeEventListener(type,listener,false);
return true;
}else if(node.removeEvent){
node.detachEvent(‘on‘+type,node[type+listener]);
node[type+listener] = null;
return true;
}
return false;
};
//获取事件对象
function getEventObject(e){
return e || window.event;
}
//阻止事件冒泡
function stopPropagation(eventObject){
var eventObject = eventObject || getEventObject();
if(eventObject.stopPropagation){
eventObject.stopPropagation();
}else{
eventObject.cancelBubble = true;
}
};
//阻止浏览器默认 事件
function stopDefault(eventObject){
var eventObject = eventObject || getEventObject();
if(eventObject.preventDefault){
eventObject.preventDefault();
}else{
eventObject.returnValue = false;
}
};
//获取鼠标点击时的x和y坐标
function getPointerPositionInDocument(eventObject) {
eventObject = eventObject || getEventObject(eventObject);
var x = eventObject.pageX || (eventObject.clientX +
(document.documentElement.scrollLeft || document.body.scrollLeft));
var y = eventObject.pageY || (eventObject.clientY +
(document.documentElement.scrollTop || document.body.scrollTop));
return {
‘x‘: x,
‘y‘: y
};
};
//获取文档的宽和高
function getWindowSize(){
var width = height = 0;
if(this.innerWidth){
width = this.innerWidth;
height = this.innerHeight;
}else if(document.documentElement && document.documentElement.clientHeight){
width = document.documentElement.clientWidth;
height = document.documentElement.clientHeight;
}else if(document.body && document.body.clientHeight){
width = document.body.clientWidth;
height = document.body.clientHeight;
}
return {‘width‘:width,‘height‘:height};
};
//获取标签的宽、高和left、top
function getDimensions(element){
if (!(element = $(element))) return false;
return {
‘left‘:element.offsetLeft,
‘top‘:element.offsetTop,
‘width‘:element.offsetWidth,
‘height‘:element.offsetHeight
};
}
//设置标签样式
function setStyle(element, styles) {
if (!(element = $(element))) return false;
for (property in styles) {
if (!styles.hasOwnProperty(property)) continue;
if (element.style.setProperty) {
element.style.setProperty(
uncamelize(property, ‘-‘), styles[property], null);
} else {
element.style[camelize(property)] = styles[property];
}
}
return true;
};
//将-形式的字符串转换为驼峰命名法的字符串
function camelize(s) {
return s.replace(/-(\w)/g, function(strMatch, p1) {
return p1.toUpperCase();
});
};
</script>标签：
原文地址：http://www.cnblogs.com/wangwei1234/p/4641608.html
