JavaScript中的鼠标事件问题
我刚刚开始学习JavaScript,我正在尝试创建一个执行以下步骤的函数JavaScript中的鼠标事件问题,javascript,drag-and-drop,mouseevent,mouse,Javascript,Drag And Drop,Mouseevent,Mouse,我刚刚开始学习JavaScript,我正在尝试创建一个执行以下步骤的函数 记录用户单击并按住的位置的x坐标(onmousedown(?),而不是onclick) 然后,当鼠标仍在向下单击时,鼠标在x方向上每移动±100个单位,我希望发生一个动作(对于这个问题不重要,但例如,会出现一个弹出窗口) 当用户释放鼠标(onmouseup(?)时,函数停止跟踪用户的鼠标位置,操作停止(如果如示例所示,弹出窗口将不再弹出) 如果用户再次单击向下,请重复步骤1-3 这是我痛苦的尝试 <DOCTYPE!
<DOCTYPE! html>
<html >
<body onmousedown="doThing()">
<script type="text/javascript">
//global variable that tracks whether or not mouse is down or up.
var mouseDown = 0;
document.body.onmousedown = function()
{
++mouseDown;
}
document.body.onmouseup = function()
{
--mouseDown;
}
//displays the state of the mouse on screen. 1 means mouse is down, 0 means mouse is up.
function track()
{
mouseState.innerHTML = mouseDown;
}
//when the mouse moves 100 units in either direction from the location of the initial downclick, a popup appears
function doThing()
{
var xPos = window.event.clientX;
if (mouseDown==1 && ((Math.abs(xPos-window.event.clientX))>100))
alert("yay");
}
</script>
<div align="center"><span id="mouseState"></span></div>
</body>
</html>
//跟踪鼠标是否向下或向上的全局变量。
var mouseDown=0;
document.body.onmousedown=函数()
{
++穆斯敦;
}
document.body.onmouseup=函数()
{
--穆斯敦;
}
//在屏幕上显示鼠标的状态。1表示鼠标下降,0表示鼠标上升。
函数跟踪()
{
mouseState.innerHTML=mouseDown;
}
//当鼠标从初始下击位置向任意方向移动100个单位时,会出现一个弹出窗口
函数doThing()
{
var xPos=window.event.clientX;
如果(mouseDown==1&((Math.abs(xPos window.event.clientX))>100))
警惕(“耶”);
}
非常感谢您对任何事情的反馈/帮助/提示 这就是我想到的:
非常感谢。这正是我所需要的,你做得很快!非常感谢!
//global variable that tracks whether or not mouse is down or up.
var mouseDown = 0;
//global variable that tracks where the mouse position when pressed
var firstPos = 0;
document.body.onmousedown = function(event)
{
mouseDown = 1;
track();
firstPos = window.event.clientX;
}
document.body.onmouseup = function(event)
{
mouseDown = 0
track();
firstPos = 0;
}
document.body.onmousemove = function()
{
if (mouseDown == 1){
doThing();
}
}
document.body.onmouseout = function()
{
//important because when you click the alert button `onmouseup` won't be triggered
mouseDown = 0;
}
//displays the state of the mouse on screen. 1 means mouse is down, 0 means mouse is up.
function track()
{
mouseState.innerHTML = mouseDown;
}
//when the mouse moves 100 units in either direction from the location of the initial downclick, a popup appears
function doThing(event)
{
if (mouseDown==1 && ((Math.abs(firstPos-window.event.clientX))>100))
alert("yay");
}