trigger自动执行事件

html

<button>点击文字变红</button>
 <p>trigger出发点击事件</p>

js

$('button').click(function(event) {
            $(this).next().css('color','red');
        });
        $('button').trigger('click'); //不用点击颜色就变红了

或者通过a来点击b

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <style type="text/css">
  div{ 200px;height: 200px;margin:20px;background-color:pink;}
    </style>
    <body>
           <div class='box1' onclick='box1(this)'>盒子1</div>
           <div onclick='box2(this)'>盒子2</div>

    </body>
    <script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
    <script type="text/javascript">
        function box1(self){
            console.log(self)
        }

        function box2(self){
            $('.box1').trigger("click")
        }

    </script>
</html>