<h2>自定义事件trigger</h2>
    <div class="left">
        <div>
        <span></span>
        <span>0</span>
        点击次数
        </div>
        <button>直接点击</button>
        <button>通过自定义点击</button>
    </div>
    <script type="text/javascript">
    n=0;
    $("button:first").click(function(e,buttonName){
    buttonName = buttonName||'first';
    update(buttonName);
    });
    $("button:last").click(function(){
    $("button:first").trigger('click','last');
    });
    function update(buttonName){
    $("span:first").text(buttonName);
    $("span:last").text(++n);
    }
    </script>