點選清除快取的按鈕

// 清除快取
    $('.clear-file').click(function(){
        var con = confirm("確認要清除快取嗎？");
        if(con){
            mui.plusReady(function(){
                var local_image_url = '_downloads/image'; // 快取本地圖片url
                plus.io.resolveLocalFileSystemURL(local_image_url, function(entry)
 
 {
                    entry.removeRecursively( function ( entry ) {
                        alert("刪除成功!");
                        plus.console.log( "Remove succeeded" );
                    }, function ( e ) {
                        alert( e.message );
                    } );
                });
            });
        }
    })