javascript - 我如何检查行是否为空然后不显示它？

Question

这是我在我的 javascript 中用来从文本文件中读取行并将它们添加到 jquery 插件 newsticker 的部分:

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>
<script src="http://risq.github.io/jquery-advanced-news-ticker/assets/js/jquery.newsTicker.js"></script>
<style>
.newsticker {
    max-width: 620px;
    margin: auto;
}

.newsticker li {
    color: #4e4e4e;
    background: #F2F2F2;
    overflow: hidden;
    height: 28px;
    padding: 10px;
    line-height: 30px;
    list-style: none;
    font-size: 20px;
    text-align: left;
    border-bottom: 1px dotted #2c8162;
}

.newsticker li:hover {
    background: #FFF;
}
</style>
<script>
   $('body').find('.newsticker').remove();//It will clear old data if its present 
   var file = "http://newsxpressmedia.com/files/theme/test.txt";
    $.get(file, function (txt) {
            //var lines = txt.responseText.split("\n");
            var lines = txt.split("\n");
            $ul = $('<ul class="newsticker" />');
            for (var i = 0, len = lines.length; i < len; i++) {
                //save(lines[i]); // not sure what this does
                $ul.append('<li>' + lines[i] + '</li>'); //here 
            }
            //$ul.appendTo('body').newsTicker({
            $ul.appendTo('div.wcustomhtml').newsTicker({
                row_height: 48,
                max_rows: 2,
                speed: 6000,
                direction: 'up',
                duration: 1000,
                autostart: 1,
                pauseOnHover: 1
            });
    });
</script>

例如文本文件中的内容格式是这样的:

Hello everyone5/3/2014Hi world5/3/2013This is a test6/3/2012

I want each time to dislay two lines in the plugin jquery for exmaple this is two lines:

Hi world5/3/2013

Then after this two lines there is empty lines space so dont display it. Then the next two lines.So in the plugin jquery newsTicker i should see the text scrolling like this:

Hello everyone5/3/2014Hi world5/3/2013This is a test6/3/2012

Each time two lines without the space/empty lines. In general it's working but it also show the empty/space lines too.

EDIT**

This is the text file content how it look like:

http://textuploader.com/rl0v

文本是希伯来文，但例如这是两行:

דיווח:ראמי מחלוף,מבכיוממשטוששל אסד,עזב עם משפחתו את סוריה.מבזקים.דווח במק한 בתאריך: 2014 年 4 月 7 日

然后是空行，然后是另外两行。这两行我想每次都在 jquery newsticker 中显示，并将它们作为两行的一个 block 向上滚动。

Answer 1

如何改变 for 循环的行的步骤:

   $('body').find('.newsticker').remove();//It will clear old data if its present 
   var file = "http://newsxpressmedia.com/files/theme/test.txt";
    $.get(file, function (txt) {
            //var lines = txt.responseText.split("\n");
            var lines = txt.split("\n");
            $ul = $('<ul class="newsticker" />');
            for (var i = 0, len = lines.length; i < len; i+=3) {  // step: 3
                //save(lines[i]); // not sure what this does
                $ul.append('<li>' + lines[i] + '</li>'); //here 
                $ul.append('<li>' + lines[i+1] + '</li>');
            }
            //$ul.appendTo('body').newsTicker({
            $ul.appendTo('div.wcustomhtml').newsTicker({
                row_height: 48,
                max_rows: 2,
                speed: 6000,
                direction: 'up',
                duration: 1000,
                autostart: 1,
                pauseOnHover: 1
            });
    });