JS~重写alter与confirm，让它们变成fancybox风格

插件与系统命令

对于很多JS弹框插件来说，都提供了alter,confirm等功能，如fancybox,Boxy等插件，今天来介绍一下如何将系统的alter和confirm替换成指定插件的alter和confirm，使用替换的方式的好处就是不用修改之前的代码，这在面向对象里，

叫做“对修改关闭，对扩展开放”，也称为OCP原则，即开闭原则。

fancybox替换系统命令，它需要有一个HTML容器来展现弹框

<script id="MessageBox_delete" type="text/html">
    <!--试题删除确认弹出框 start-->
    <div class="r_warnBox" style="width: 276px;">
        <div class="r_warnBox_tit">
            <h3><strong>提示</strong></h3>
        </div>
        <div class="r_roomBoxContDel">
            <p class="alert">您确定删除作业吗？</p>
            <p class="confirm"><a class="sure" href="javascript:;">确定</a><a class="cancel" href="javascript:;" onclick="$.fancybox.close();">取消</a></p>
        </div>
        <a class="r_warnBox_close" href="javascript:;" onclick="$.fancybox.close();"></a>
    </div>
    <!--试题删除确认弹出框 end-->
</script>
<!--弹出框1 start-->
<script id="MessageBox_message" type="text/html">
    <div class='r_warnBox' style='width: 433px; padding-right: 30px;'>
        <div class='r_warnBox_tit'>
            <h3><strong>提示
            </strong></h3>
        </div>
        <div id='alert_message' class='r_roomBoxCont'>
            <p class='alert'>[Content]</p>
        </div>
        <a class='r_warnBox_close' href='javascript:;' onclick="$.fancybox.close()"></a>
    </div>
</script>
<!--弹出框1 end-->

下面是复写语句

 window.alert = function (msg) {
        var reg = new RegExp("\\[([^\\[\\]]*?)\\]", 'igm'); //i g m是指分别用于指定区分大小写的匹配、全局匹配和多行匹配。
        var html = document.getElementById("MessageBox_message").innerHTML;
        var result = html.replace(reg, function (node, key) { return { 'Content': msg }[key]; });
        $.fancybox(result, {
            'padding': 0,
            'scrolling': 'visible',
            'closeBtn': false,
            'modal': false
    });

    }
    window.confirm = function (msg, callBack) {
        $.fancybox($("#MessageBox_delete").html(), {
            'padding': 0,
            'scrolling': 'visible',
            'closeBtn': false,
            'modal': false,
            afterShow: function () {
                $('p.confirm a.sure').on('click', function () {
                    callBack();
                });
            }
        });

    }

下面是调用语句

function alerttest() {
        alert("ok");
    }
    function confirmtest() {
        confirm("are you sure!", function () { alert("删除成功") });
    }

Boxy替换系统命令，使用相对简单，它已经为我们创建的弹框的DIV

window.alert = function (msg) {
  Boxy.alert(msg);
}

window.alert = function (msg,callback) {
  Boxy.confirm(msg,callback);
}

调用和fancybox也是一样的

  function alerttest() {
        alert("ok");
    }
  function confirmtest() {
        confirm("are you sure!", function () { alert("删除成功") });
    }

最后运行效果如图

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