试了很多方法，还是报plus is not defined？

1，引入js路径没问题。

<script src="../js/mui.min.js"></script>

2，写在mui.plusReady中。

<script type="text/javascript" charset="utf-8">  
            mui.init();  
            mui.plusReady(function(){  
                var cDate=document.getElementById("classDate");  
                var cTime=document.getElementById("classTime");  
                var cCity=document.getElementById("classCity");  
                var cAddress=document.getElementById("detailAddress");  

                cDate.addEventListener("tap",function(){  
                    var nDate=new Date();  
                    nDate.setFullYear();  
                    var minDate=new Date();  
                    minDate.setFullYear(2010,0,1);  
                    var maxDate=new Date();  
                    maxDate.setFullYear(2020,11,31);  
                    puls.nativeUI.pickDate(function(e){  
                        var d=e.date;  
                        d.value=d.getFullYear()+"-"+(d.getMonth()-1)+"-"+d.getDate();  
                    });  
                });  
            });  
        </script>

3，在hbuilder中手机运行中运行，点击页面按钮，总是报
Uncaught ReferenceError: puls is not defined at warps/order.html:27