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javascript每日一练（八）——事件三：默认行为

2013-07-24 21:34 232 查看

一、阻止默认行为

　　return false;

自定义右键菜单

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
#div1{ width:100px; height:100px; background:red; position:absolute;}
</style>
<script>
window.onload = function()
{
var oDiv = document.getElementById('div1');
var disX = 0;
var disY = 0;

oDiv.onmousedown = function(ev)
{
var oEvent = ev || event;
disX = oEvent.clientX - oDiv.offsetLeft;
disY = oEvent.clientY - oDiv.offsetTop;

document.onmousemove = function(ev)
{
var oEvent = ev || event;
var iX = oEvent.clientX - disX;
var iY = oEvent.clientY - disY;

if(iX < 0)
{
iX = 0;
}
else if( iX > document.documentElement.clientWidth - oDiv.offsetWidth)
{
iX = document.documentElement.clientWidth - oDiv.offsetWidth;
}
if(iY < 0)
{
iY = 0;
}else if( iY > document.documentElement.clientHeight - oDiv.offsetHeight)
{
iY = document.documentElement.clientHeight - oDiv.offsetHeight;
}

oDiv.style.left = iX + 'px';
oDiv.style.top = iY + 'px';
};

document.onmouseup = function()
{
document.onmousemove = null;
document.onmouseup = null;
};

return false;

};
};
</script>
</head>

<body>
<div id="div1"></div>
</body>
</html>

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