bootstrap如何设置鼠标悬停提示

<button data-placement="bottom"></button>

$(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> 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>@@##@@</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);                  });