📄 7.html
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<HTML>
<HEAD>
<TITLE>CSS Demo</TITLE>
<SCRIPT LANGUAGE="JavaScript">
<!--
ns4 = (document.layers)? true:false
ie4 = (document.all)? true:false
function init() {
if (ns4) {
dragObj = document.squareDiv
dragObj.xpos = dragObj.left
dragObj.ypos = dragObj.top
}
if (ie4) {
dragObj = squareDiv.style
dragObj.xpos = dragObj.pixelLeft
dragObj.ypos = dragObj.pixelTop
}
dragActive = false
document.onmousedown = mouseDown
document.onmousemove = mouseMove
document.onmouseup = mouseUp
if (ns4) document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP)
}
function mouseDown(e) {
if ((ns4 && e.which == 1) || ie4) {
if (ns4) {var x=e.pageX; var y=e.pageY}
if (ie4) {var x=event.x; var y=event.y+document.body.scrollTop}
dragClickX = x-dragObj.xpos
dragClickY = y-dragObj.ypos
dragActive = true
}
}
function mouseMove(e) {
if (ns4) {var x=e.pageX; var y=e.pageY}
if (ie4) {var x=event.x; var y=event.y+document.body.scrollTop}
if (dragActive) {
dragObj.xpos = x-dragClickX
dragObj.ypos = y-dragClickY
dragObj.left = dragObj.xpos
dragObj.top = dragObj.ypos
return false
}
}
function mouseUp(e) {
if (ns4) {var x=e.pageX; var y=e.pageY}
if (ie4) {var x=event.x; var y=event.y+document.body.scrollTop}
dragActive = false
}
//-->
</SCRIPT>
<STYLE TYPE="text/css">
<!--
#squareDiv {position:absolute; left:100; top:100; width:50; height:50; clip:rect(0,50,50,0); background-color:blue;}
-->
</STYLE>
</HEAD>
<BODY onLoad="init()">
<DIV ID="instructions" STYLE="position:absolute;">
无论单击页面的何处，方块都会感应到。
<BR>当按住鼠标左键时可以任意拖动方块。
<BR>当释放鼠标后，方块同时也会停止移动。
</DIV>
<DIV ID="squareDiv"></DIV>
</BODY>
</HTML>
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