jQuery 回调函数（callback）的使用和基础

前端技术 2023/09/06 JavaScript

还是先贴代码吧

复制代码 代码如下:

<!DOCTYPE html>
<html>
    <head>
        <meta charset=\"utf-8\">
        <title></title>
        <script src=\"js/jquery.js\"></script>
    </head>
<style>
body{font-family: \"微软雅黑\";width: 980px; margin: 0 auto; text-align: center;}
    .box{
        width: 300px;
        height: 300px;
        background: green;
        border: 1px solid #e6e6e6;
        margintop: 50px;
        line-height: 200px;
        position: absolute;
    }
button{
    border: none;
    background: green;   
    width: 100px;
    height: 50px;
    line-height: 50px;
    color: #fff;
    font-size: 16px;
    margin-top: 50px;
    }
</style>
    <body>
        <button>点击开始动画</button>
        <div class=\"box\" ></div>
        <script>
            $(document).ready(function(){
              $(\"button\").click(function(){
                var div=$(\".box\");
                div.animate({height:\'200px\',opacity:\'0.4\'},\"slow\");
                div.animate({width:\'200px\',opacity:\'0.8\'},\"slow\");
                div.animate({height:\'100px\',opacity:\'0.4\'},\"slow\");
                div.animate({width:\'100px\',opacity:\'0.8\'},\"slow\");
                div.animate({right:\'100px\',opacity:\'0.8\'},\"slow\");
                div.animate({bottom:\'100px\',opacity:\'0.8\'},\"slow\");
                div.animate({left:\'100px\',opacity:\'0.8\'},\"slow\");
                div.animate({top:\'100px\',opacity:\'0.8\'},\"slow\",function(){
                    alert(\"The paragraph is over\");
                });
              });
            });
        </script>
        <script>
            $(document).ready(function(){
                $(\"button\").click(function(){
                    var div=$(\".box\");
                        div.animate({height:\'300px\',opacity:\'0.4\'},\"slow\");
                        div.animate({width:\'300px\',opacity:\'0.8\'},\"slow\");
                        div.animate({height:\'100px\',opacity:\'0.4\'},\"slow\");
                        div.animate({width:\'100px\',opacity:\'0.8\'},\"slow\",function(){
                    alert(\"The paragraph is over\");
              　　　　  });
                    });
                });
            });
        </script>
    </body>
</html>

所谓的回调函数，其实就是在 speed 或 duration 参数可以设置许多不同的值，比如 \"slow\", \"fast\", \"normal\" 或毫秒  后面再添加函数，显示相对应的内容，以提示网民

小伙伴们对jQuery回调函数是否有了新的认识了呢，希望本文能给大家一些帮助。

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