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在onmousedown tag= true
在onmouseup tag = falseonmousemove时,时刻计算这个矩形框,然后弄个div层(半透明)覆盖这个矩形框,
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>鼠标捕获事件</title>
<script>
var tag = false;
function aa(e)
{
var e1 = e || window.event;
document.getElementById("x").value = e1.clientX;
document.getElementById("y").value = e1.clientY;
tag = true;
this.md();
}
function bb(e)
{
tag = false;
var e1 = e || window.event;
var kk = e1.clientX-document.getElementById("x").value;
var gg = e1.clientY-document.getElementById("y").value;
document.getElementById("k").value = kk;
document.getElementById("g").value = gg;
}
function md()
{
tag = true;
//alert('ok');
d.style.display="";
d.setCapture();
d.onmouseup=d.onlosecapture=mu;
d.onmousemove=mv;
d.startX=event.clientX;
d.startY=event.clientY;
d.style.left=event.x;
d.style.top=event.y;
d.style.width=0;
d.style.height=0;
}
function mu()
{
d.releaseCapture();
d.style.display="none";
}
function mv()
{
var x2=event.clientX;
var y2=event.clientY;
x=Math.min(d.startX,x2);
y=Math.min(d.startY,y2);
x1=Math.max(d.startX,x2);
y1=Math.max(d.startY,y2);
with(d.style){
left=x;
top=y;
width=x1-x;
height=y1-y;
}
}
</script>
</head><body onmousedown="md()">
<div style="border:#000 1px dotted;position:absolute;overflow:hidden;background-Color:#EFEFEF;display:none;" id="d"></div>
X:<input type="text" id="x" name="x" /> Y:<input type="text" id="y" name="y" /> 宽:<input type="text" id="k" name="k" /> 高:<input type="text" id="g" name="g" />
<div style="background-image:url(太阳能 9-16.jpg); width:1123px; height:770px; border:1px solid:#000000;" onmousedown="aa(event)" onmouseup="bb(event)" id="t"></div>
</body>
</html>还是不好使。 我主要把注释去掉就不好使了
function md(){
d.style.display="";
d.setCapture();
d.onmouseup=d.onlosecapture=mu;
d.onmousemove=mv;
d.startX=event.clientX;
d.startY=event.clientY;
d.style.left=event.x;
d.style.top=event.y;
d.style.width=0;
d.style.height=0;
}
function mu(){
d.releaseCapture();
d.style.display="none";
}
function mv(){
var x2=event.clientX;
var y2=event.clientY;
x=Math.min(d.startX,x2);
y=Math.min(d.startY,y2);
x1=Math.max(d.startX,x2);
y1=Math.max(d.startY,y2);
with(d.style){
left=x;
top=y;
width=x1-x;
height=y1-y;
}
}
</script>
<body onmousedown=md() >
<div style="border:#000 1px dotted;position:absolute;overflow:hidden;background-Color:#EFEFEF;display:none;" id="d"></div>