trustieforge/app/views/applied_project/applied_join_project.js.erb

<% if @status == 0%>
    alert("您申请的项目不存在");
<% elsif @status == 1%>
    alert("请勿重复申请加入该项目");
<% elsif @status == 2%>
    alert("申请成功");
<% elsif @status == 3%>
    alert("您已加入该项目");
<%else%>
    alert("申请失败");
<%end%>