bootstrap如何设置鼠标悬停提示

1、 　　　　

<button type="button" rel="drevil" data-content="报名截止时间：'+time+'" data-container="body" data-toggle="popover" 
data-placement="bottom"></button>

2、

$(function () { $("[data-toggle='popover']").popover(); });　　　　
　　 $("[rel=drevil]").popover({
 trigger:'manual',
 //placement : 'bottom', //placement of the popover. also can use top, bottom, 
 left or right
 //天title : '<div style="text-align:center; color:red; text-decoration:underline; 
 font-size:14px;"> Muah ha ha</div>', //this is the top title bar of the popover. 
 add some basic css
 html: 'true', //needed to show html of course
 //content : '<div id="popOverBox"><img src="http://www.hd-report.com/wp-content
 /uploads/2008/08/mr-evil.jpg" width="251" height="201" /></div>', //this is the 
 content of the html box. add the image here or anything you want really.
 animation: false
 }).on("mouseenter", function () {
 var _this = this;
 $(this).popover("show");
 $(this).siblings(".popover").on("mouseleave", function () {
 $(_this).popover('hide');
 });
 }).on("mouseleave", function () {
 var _this = this;
 setTimeout(function () {
 if (!$(".popover:hover").length) {
 $(_this).popover("hide")
 }
 }, 300);
 });