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使用bootstrap 3.3.7的tooltip时，当tooltip关闭时会抛出Uncaught TypeError: Cannot read property ‘off’ of null的错误。github上有说是3.3.7的bug，见。

解决方法：直接修改bootstrap.js源码。如下

第一处：修改1489-1497行以下位置

var complete = function () {
           var prevHoverState = that.hoverState//        that.$element.trigger('shown.bs.' + that.type)        // fix the bug Uncaught TypeError: Cannot read property 'off' of null        null != that.$element && that.$element.trigger('shown.bs.' + that.type)        that.hoverState = null        if (prevHoverState == 'out') that.leave(that)      }

第二处：修改1733-1748行以下位置

Tooltip.prototype.destroy = function () {
       var that = this    clearTimeout(this.timeout)    this.hide(function () {
         // that.$element.off('.' + that.type).removeData('bs.' + that.type)      // fix the bug Uncaught TypeError: Cannot read property 'off' of null      null != that.$element && that.$element.off('.' + that.type).removeData('bs.' + that.type)      if (that.$tip) {
           that.$tip.detach()      }      that.$tip = null      that.$arrow = null      that.$viewport = null      that.$element = null    })  }

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