可以用鼠标随意拖动位置的图片

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可以用鼠标随意拖动位置的图片

作者:admin 发布时间:2010-10-18 8:24:08 发布人: admin

<html>
<head>
<title>可以用鼠标随意拖动位置的图片丨网页特效丨myjs.jz123.cn</title>
<style type="text/css">
 #plane1 {position:absolute; left:290; top:170; width:121; z-index:0}
 #plane2 {position:absolute; left:400; top:250; width:118; z-index:0}
</style>
<script language="JavaScript">
var isNav, isIE
if (parseInt(navigator.appVersion) >= 4) {
 if (navigator.appName == "Netscape") {
  isNav = true
 } else {
  isIE = true
 }
}

// ***Begin CSS custom API Functions***
// Set zIndex property
function setZIndex(obj, zOrder) {
 obj.zIndex = zOrder
}
// Position an object at a specific pixel coordinate
function shiftTo(obj, x, y) {
 if (isNav) {
  obj.moveTo(x,y)
 } else {
  obj.pixelLeft = x
  obj.pixelTop = y
 }
}
// ***End API Functions***

// Global holds reference to selected element
var selectedObj
// Globals hold location of click relative to element
var offsetX, offsetY

// Find out which element has been clicked on
function setSelectedElem(evt) {
 if (isNav) {
  // declare local var for use in upcoming loop
  var testObj
  // make copies of event coords for use in upcoming loop
  var clickX = evt.pageX
  var clickY = evt.pageY
  // loop through all layers (starting with frontmost layer)
  // to find if the event coordinates are in the layer
  for (var i = document.layers.length - 1; i >= 0; i--) {
   testObj = document.layers[i]
   if ((clickX > testObj.left) && 
    (clickX < testObj.left + testObj.clip.width) && 
    (clickY > testObj.top) && 
    (clickY < testObj.top + testObj.clip.height)) {
     // if so, then set the global to the layer, bring it
     // forward, and get outa here
     selectedObj = testObj
     setZIndex(selectedObj, 100)
     return
   }
  }
 } else {
  // use IE event model to get the targeted element
  var imgObj = window.event.srcElement
  // make sure it's one of our planes
  if (imgObj.parentElement.id.indexOf("plane") != -1) {
   // then set the global to the style property of the element,
   // bring it forward, and say adios
   selectedObj = imgObj.parentElement.style
   setZIndex(selectedObj,100)
   return
  }
 }
 // the user probably clicked on the background
 selectedObj = null
 return
}
// Drag an element
function dragIt(evt) {
 // operate only if a plane is selected
 if (selectedObj) {
  if (isNav) {
   shiftTo(selectedObj, (evt.pageX - offsetX), (evt.pageY - offsetY))
  } else {
   shiftTo(selectedObj, (window.event.clientX - offsetX), (window.event.clientY - offsetY))
   // prevent further system response to dragging in IE
   return false
  }
 }
}
// Set globals to connect with selected element
function engage(evt) {
 setSelectedElem(evt)
 if (selectedObj) {
  // set globals that remember where the click is in relation to the
  // top left corner of the element so we can keep the element-to-cursor
  // relationship constant throughout the drag
  if (isNav) {
   offsetX = evt.pageX - selectedObj.left
   offsetY = evt.pageY - selectedObj.top
  } else {
   offsetX = window.event.offsetX
   offsetY = window.event.offsetY
  }
 }
 // block mouseDown event from forcing Mac to display
 // contextual menu.
 return false
}
// Restore elements and globals to initial values
function release(evt) {
 if (selectedObj) {
  setZIndex(selectedObj, 0)
  selectedObj = null
 }
}
// Turn on event capture for Navigator
function setNavEventCapture() {
 if (isNav) {
  document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP)
 }
}
// Assign event handlers used by both Navigator and IE (called by onLoad)
function init() {
 if (isNav) {
  setNavEventCapture()
 }
 // assign functions to each of the events (works for both Navigator and IE)
 document.onmousedown = engage
 document.onmousemove = dragIt
 document.onmouseup = release
}
</script>
</head>
<body bgcolor="#fef4d9" onload="init()">
下面的图像你可以用鼠标随意拖动
<div id="plane1"><img name="planePic1" src="http://web.archive.org/web/20150530064257im_/http://www.jz123.cn/image/logo.png" border="0"></div>
</body>
</html>

可以用鼠标随意拖动位置的图片

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