//最近项目中需要将angular-ui-bootstrap中用到的弹出框，使之可拖动，由于源文件中没有实现，需要自己实现指令，以下即为该指令，亲测可以实现。 .directive('draggable', ['$document', function($document) {                return function(scope, element, attr) {                var startX = 0, startY = 0, x = 0, y = 0;                element= angular.element(document.getElementsByClassName("modal-dialog"));                 element.css({                    position: 'relative',                    cursor: 'move'                });                element.on('mousedown', function(event) {                    // Prevent default dragging of selected content                    event.preventDefault();                    startX = event.pageX - x;                    startY = event.pageY - y;                    $document.on('mousemove', mousemove);                    $document.on('mouseup', mouseup);                });                function mousemove(event) {                    y = event.pageY - startY;                    x = event.pageX - startX;                    element.css({                    top: y + 'px',                    left:  x + 'px'                    });                }                function mouseup() {                    $document.off('mousemove', mousemove);                    $document.off('mouseup', mouseup);                }                };    }]);

 如图：已不在屏幕中央，为拖动后的效果