发布于 2016-12-30 03:34:06 | 107 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程，程序狗速度看过来！
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言，主要目的是为了解决服务器端语言，比如Perl，遗留的速度问题，为客户提供更流畅的浏览效果。
<HTML>
<HEAD>
<TITLE>JS+CSS制作的DIV层最小化和随意拖拽排序功能</TITLE>
<style type="text/css">
body
{
margin:10px;
}
#dragHelper
{
position:absolute;/*重要*/
border:2px dashed #000000;
background-color:#FFFFFF;
filter: alpha(opacity=30);
}
.normal
{
position:absolute;/*重要*/
width:300px;
#height:10px;
border:1px solid #666666;
background-color:#FFFFFF;
}
.over
{
position:absolute;/*重要*/
width:300px;
#height:10px;
border:1px solid #666666;
background-color:#f3f3f3;
filter: alpha(opacity=50);
}
.dragArea {
CURSOR: move;
}
</style>
</HEAD>
<BODY oncontextmenu="window.event.returnValue=false">
<div id="dragHelper" style="display:none"></div>
<div class="normal" overClass="over" dragClass="normal">
<table width="100%">
<tbody>
<tr bgcolor="#CCCCCC" bar="yes"><td>百度</td><td dragArea="yes" class="dragArea">点此拖动</td><td><a href="#" onclick="openClose(this)">-</a> x</td></tr>
<tr><td colspan="3">地址:http://www.baidu.com</td></tr>
<tr><td colspan="3">关键字:</td></tr>
<tr><td colspan="3">说明:</td></tr>
</tbody>
</table>
</div>
<div class="normal" overClass="over" dragClass="normal">
<table width="100%">
<tbody>
<tr bgcolor="#CCCCCC" bar="yes"><td>新浪</td><td dragArea="yes" class="dragArea">........</td><td><a href="#" onclick="openClose(this)">-</a> x</td></tr>
<tr><td colspan="3">地址:http://www.sina.com.cn</td></tr>
<tr><td colspan="3">关键字:</td></tr>
<tr><td colspan="3">说明:</td></tr>
</tbody>
</table>
</div>
<div class="normal" overClass="over" dragClass="normal">
<table width="100%">
<tbody>
<tr bgcolor="#CCCCCC" bar="yes"><td>网页特效</td><td dragArea="yes" class="dragArea">........</td><td><a href="#" onclick="openClose(this)">-</a> x</td></tr>
<tr><td colspan="3">地址：http://www.CsrCode.cn</td></tr>
<tr><td colspan="3">关键字:</td></tr>
<tr><td colspan="3">说明:</td></tr>
</tbody>
</table>
</div>
<div class="normal" overClass="over" dragClass="normal">
<table width="100%">
<tbody>
<tr bgcolor="#CCCCCC" bar="yes"><td>七彩影视</td><td dragArea="yes" class="dragArea">........</td><td><a href="#" onclick="openClose(this)">-</a> x</td></tr>
<tr><td colspan="3">地址：http://www.33567.cn</td></tr>
<tr><td colspan="3">关键字:</td></tr>
<tr><td colspan="3">说明:</td></tr>
</tbody>
</table>
</div>
</BODY>
<SCRIPT LANGUAGE="JavaScript">
<!--
var dragObjs = [];//可以拖拽的元素数组
var dragObjTops = [];
var dragHelper = document.getElementById("dragHelper");//拖拽时位置框
var dragObj = null;//拖拽对象元素
var dragObjPos = 0;
var dragObjOffset = {left:0,top:0};//拖拽对象原始位置
var mouseInDragObjOffset = {x:0,y:0};//鼠标在拖拽对象中的相对位置
var initHeight = 40;
Number.prototype.NaN0=function(){return isNaN(this)?0:this;}
function getPosition(e){//获取元素相对文档的绝对位置
var left = 0;
var top = 0;
while (e.offsetParent){
left += e.offsetLeft;
top += e.offsetTop;
e = e.offsetParent;
}
left += e.offsetLeft;
top += e.offsetTop;
return {x:left, y:top};
}
function mouseCoords(ev){//获取鼠标相对文档的绝对位置
if(ev.pageX || ev.pageY){
return {x:ev.pageX, y:ev.pageY};
}
return {
x:ev.clientX + document.body.scrollLeft - document.body.clientLeft,
y:ev.clientY + document.body.scrollTop - document.body.clientTop
};
}
function getMouseOffset(target, ev){//获取鼠标相对元素的相对位置
ev = ev || window.event;
var elementPos = getPosition(target);
var mousePos = mouseCoords(ev);
return {x:mousePos.x - elementPos.x, y:mousePos.y - elementPos.y};
}
function mouseDown(ev){
ev = ev || window.event;
target = ev.srcElement || ev.target;
if(dragObj){
return;
}
var dragArea = false;
if(target.getAttribute("dragArea")){
dragArea = true;
}
while(!target.getAttribute("isDragObj")){
if(target.tagName=="HTML")
break;
target = target.parentNode;
}
if(dragArea && target.getAttribute("isDragObj")){
dragObj = target;
//重写的目的是让当前对象在最上层
document.body.removeChild(dragObj);
document.body.appendChild(dragObj);
//记录下拖拽对象原始位置
dragObjOffset.left = dragObj.style.left;
dragObjOffset.top = dragObj.style.top;
dragObj.className = dragObj.getAttribute("overClass");
//鼠标在拖拽对象中的相对位置
mouseInDragObjOffset = getMouseOffset(dragObj, ev);
dragHelper.style.left = dragObj.style.left;
dragHelper.style.top = dragObj.style.top;
dragHelper.style.width = dragObj.offsetWidth;
dragHelper.style.height = dragObj.offsetHeight;
dragHelper.style.display = "";
//alert(dragObj.offsetWidth+":"+dragObj.clientWidth);
}
}
function mouseUp(ev){
ev = ev || window.event;
target = ev.srcElement || ev.target;
if(dragObj){
dragObj.style.left = dragHelper.style.left;
dragObj.style.top = dragHelper.style.top;
dragHelper.style.display = "none";
dragObj.className = dragObj.getAttribute("dragClass");
dragObj = null;
}
}
function mouseMove(ev){
ev = ev || window.event;
if(dragObj) {
var mousePos = mouseCoords(ev);
/*dragHelper.style.left = dragObjOffset.left;
dragHelper.style.top = dragObjOffset.top;
dragHelper.style.width = dragObj.offsetWidth;
dragHelper.style.height = dragObj.offsetHeight;
dragHelper.style.display = "";*/
var windowWidth = document.body.offsetWidth;//窗口宽度
var windowHeight = document.body.offsetHeight;//窗口高度
//拖拽对象应该所在当前位置
var dragObjLeft = mousePos.x - mouseInDragObjOffset.x;
var dragObjTop = mousePos.y - mouseInDragObjOffset.y;
//增加判断，不然拖拽对象拖出浏览器窗口
if(dragObjLeft >= 0 && dragObjLeft <= windowWidth - dragObj.offsetWidth - 20)
dragObj.style.left = dragObjLeft;
if(dragObjTop >=0)
dragObj.style.top = dragObjTop;
repaint();
}
}
//克隆对象
function cloneObject(srcObj, destObj){
destObj = srcObj.cloneNode(true);
}
function makeDraggable(element){
element.setAttribute("isDragObj", "y");
}
function repaint(){
for(i=0; i<dragObjs.length; i++){
if(dragObjs[i] == dragObj){
dragObjPos = i;
dragObjs[i] = dragHelper;
break;
}
}
if(dragObjPos>0 && parseInt(dragObj.style.top)<parseInt(dragObjs[dragObjPos-1].style.top)){
dragObjs[dragObjPos] = dragObjs[dragObjPos-1];
dragObjs[dragObjPos-1] = dragHelper;
dragObjPos = dragObjPos - 1;
}
if(dragObjPos<dragObjs.length-1 && parseInt(dragObj.style.top)>parseInt(dragObjs[dragObjPos+1].style.top)){
dragObjs[dragObjPos] = dragObjs[dragObjPos+1];
dragObjs[dragObjPos+1] = dragHelper;
dragObjPos = dragObjPos + 1;
}
paintDragObjs();
dragObjs[dragObjPos] = dragObj;
}
function paintDragObjs(){
var h = 40;
for(i=0; i<dragObjs.length; i++){
dragObjs[i].style.left = 20;
dragObjs[i].style.top = h;
h += dragObjs[i].offsetHeight + 10;
}
}
function openClose(obj){
obj.innerHTML = obj.innerHTML=="-"?"+":"-";
while(obj.tagName != "TBODY"){
obj = obj.parentNode;
}
for(i=0; i<obj.childNodes.length; i++){
if(obj.childNodes[i].nodeName == "#text"
|| obj.childNodes[i].getAttribute("bar")){ continue; }
obj.childNodes[i].style.display=obj.childNodes[i].style.display==""?"none":"";
}
paintDragObjs();
}
document.onmousedown = mouseDown;
document.onmouseup = mouseUp;
document.onmousemove = mouseMove;
window.onload = function(){
var objs = document.getElementsByTagName("Div");
for(i=0; i<objs.length; i++){
var item = objs.item(i);
//if(i==1)item.style.height=150;
if(item.getAttribute("overClass")){
makeDraggable(item);
dragObjs.push(item);
item.style.left = 20;
item.style.top = initHeight;
dragObjTops.push(initHeight);
initHeight += item.offsetHeight + 10;
}
}
// dragHelper = document.createElement('DIV');
// dragHelper.style.cssText = 'position:absolute;display:none;';
// document.body.appendChild(dragHelper);
}
//-->
</SCRIPT>
</HTML>