Javascript函数datepicker，ajax调用后lazyload无法正常工作

I know we had to initialize javascript functions after the ajax call in success, but that too doesnt work in my case. Following is my code :

jQuery :

$.ajax({
            type:'POST',
            url:ajaxurl,
            data:{
                action:'get_more_posts',
            },
            success:function(data){
                 console.log(data);
                 $('#posts-inner-container').append(data); // data includes datepicker textbox
                 $('.datepicker').datepicker();
            }
        });

Initialize datepicker all over the site. Use following code :

$.ajax({
        type:'POST',
        url:ajaxurl,
        data:{
            action:'get_more_posts',
        },
        success:function(data){
             console.log(data);
             $('#posts-inner-container').append(data); // data includes datepicker textbox
             $(document).find('.datepicker').datepicker();
        }
    });