Jquery 中擷取專案路徑，用於給ajax的url路徑賦值

<script src="static/jquery-3.3.1.js"></script>
<script type="text/javascript">
    $(function(){
        $("#submitLogin").click(function(){
             var name = $("#name").val();
             var pwd = $("#pwd").val();
             var users = {name:name,pwd:pwd}; //拼裝成json格式
	     /* js中獲取專案的路徑 */
	     //方法一
             var protocol = window.location.protocol;
             var host = window.location.host;
             var pathname = window.location.pathname;
             var projectName = pathname.substring(0,pathname.substr(1).indexOf('/')+1);
             
             //方法2
             var curPath = window.document.location.href
             var projectNameall = curPath.substring(0,find(curPath,'/',3));
             
             $.ajax({
                 type:"POST",
                 /* url: protocol + "//" + host + projectName +"/addUser", */
                 url: projectNameall + "/addUser",
                 data:users,
                 success:function(data){
                     alert("成功");
                 },
                 error:function(e) {
                     alert("出錯："+e);
                 }
             });
        });
        
        /* 查詢str字元中cha字元在第 num 次出現的位置 */
        function find(str,cha,num){
     	    var x=str.indexOf(cha);
     	    for(var i=0;i<num;i++){
     	        x=str.indexOf(cha,x+1);
     	    }
     	    return x;
        }
        
    });
</script>