首先引用文件

<link rel="stylesheet" href="css/start_v5.css" />
<script type="text/javascript" src="js/jquery.min.js"></script>
<script type="text/javascript" src="js/plugin/jquery.tipsy.js?v=20140326"></script>
<script type="text/javascript" src="js/page/start_v5.js?v=20140326"></script>

像这样的在先客服大家也见了不少，也应该了解，不多说了核心代码：

function fixTitle($ele) {
        if ($ele.attr('title') || typeof($ele.attr('original-title')) != 'string') {
            $ele.attr('original-title', $ele.attr('title') || '').removeAttr('title');
        }
    }
    
    function Tipsy(element, options) {
        this.$element = $(element);
        this.options = options;
        this.enabled = true;
        fixTitle(this.$element);
    }
    
    Tipsy.prototype = {
        show: function() {
            var title = this.getTitle();
            if (title && this.enabled) {
                var $tip = this.tip();
                
                $tip.find('.tipsy-inner')[this.options.html ? 'html' : 'text'](title);
                $tip[0].className = 'tipsy'; // reset classname in case of dynamic gravity
                $tip.remove().css({top: 0, left: 0, visibility: 'hidden', display: 'block'}).appendTo(document.body);
                
                var pos = $.extend({}, this.$element.offset(), {
                    width: this.$element[0].offsetWidth,
                    height: this.$element[0].offsetHeight
                });
                
                var actualWidth = $tip[0].offsetWidth, actualHeight = $tip[0].offsetHeight;
                var gravity = (typeof this.options.gravity == 'function')
                                ? this.options.gravity.call(this.$element[0])
                                : this.options.gravity;
                
                var tp;
                switch (gravity.charAt(0)) {
                    case 'n':
                        tp = {top: pos.top + pos.height + this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
                        break;
                    case 's':
                        tp = {top: pos.top - actualHeight - this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
                        break;
                    case 'e':
                        tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth - this.options.offset};
                        break;
                    case 'w':
                        tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width + this.options.offset};
                        break;
                }
                
                if (gravity.length == 2) {
                    if (gravity.charAt(1) == 'w') {
                        tp.left = pos.left + pos.width / 2 - 15;
                    } else {
                        tp.left = pos.left + pos.width / 2 - actualWidth + 15;
                    }
                }
                
                $tip.css(tp).addClass('tipsy-' + gravity);
                
                if (this.options.fade) {
                    $tip.stop().css({opacity: 0, display: 'block', visibility: 'visible'}).animate({opacity: this.options.opacity});
                } else {
                    $tip.css({visibility: 'visible', opacity: this.options.opacity});
                }
            }
        },