jquery计算鼠标和指定元素之间距离的方法

(function() { var mX, mY, distance, $distance = $('#distance span'), $element = $('#element'); function calculateDistance(elem, mouseX, mouseY) { return Math.floor(Math.sqrt(Math.pow(mouseX - (elem.offset().left+(elem.width()/2)), 2) + Math.pow(mouseY - (elem.offset().top+(elem.height()/2)), 2))); } $(document).mousemove(function(e) { mX = e.pageX; mY = e.pageY; distance = calculateDistance($element, mX, mY); $distance.text(distance); }); })();