extjs 部署时动态切换上下文路径

修改index.html

...
<script type="text/javascript">
    // 获取首页上下文路径
    var basePath = window.location.href;
    basePath = basePath.substr(0, basePath.lastIndexOf('index.html'));
    // 创建base标签
    var base = document.createElement("base");
    base.setAttribute("href", basePath);
    document.getElementsByTagName('head')[0].appendChild(base);

    var Ext = Ext || {};
    ...