【javascript动画系列之网页白板】javascript实现的白板(兼容ff,ie,chrome,……)

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移动你的鼠标……

 

<script type="text/javascript">
var ball;
var mouseX = 100;
var mouseY = 100;
var angle = 0;
var radius = 0;

function draw(){
        ball = document.createElement("span");
        ball.style.position = "absolute";
        ball.style.color = "#FF0000";
        ball.style.zIndex = 999999999;
        ball.innerHTML = "●";
        document.body.appendChild(ball);
    
    ball.style["left"] = mouseX+ "px";
    ball.style["top"] = mouseY+ "px";
}
function MousePos(e)
{
    e = e || window.event;
    var x,y;
    if(!document.all){
        x = e.pageX;
        y = e.pageY;
    }
    else{
        x = e.clientX + document.documentElement.scrollLeft;
        y = e.clientY + document.documentElement.scrollTop;
    }
    return {x:x,y:y};
}
function setXY(e)
{
    e = e || window.event;
    var pos = MousePos(e);
    mouseX = pos.x;
    mouseY = pos.y;
    draw();
}
window.onload = function(){
    document.documentElement.onmousemove = function(e){
        e = e || window.event;
        setXY(e);
    };
}
</script>