更新鼠标位置,兼容IE和FF

//更新鼠标位置var mousePos = {x:0,y:0};function mouseCoords(ev){ ev= ev || window.event; if(ev.pageX || ev.pageY){ mousePos = {x:ev.pageX+10, y:ev.pageY+10}; } mousePos = { x:ev.clientX + document.documentElement.scrollLeft - document.body.clientLeft+10,y:ev.clientY + document.documentElement.scrollTop   - document.body.clientTop+10}; }