如何定位数组的定义范围

How To Target A Defined Range Of An Array

本文关键字：数组 定义 范围 定位 何定位      更新时间：2023-09-26

我下面的脚本将从一个特定的URL中获取一个完整的链接列表，用于我的dom scraper。但有些列表可以进入1000，所以我希望能够手动设置要实际抓取的链接。就像我在列表中输入从链接50开始到链接100结束一样。我该怎么做？

<form action="" method="POST">
    <label>Url to scrape: </label>
    <input type="text" name="url_scrape" id="url-scrape" />
    <input type="submit" value=" Scrape now " />
    <br />
    <input type="hidden" name="scrape" value="yes" />
    <br />
</form>
<br />
<br />
<?php
if( $_POST['scrape'] != 'yes' )
    return;

include('simple_html_dom.php');
function strim( $input ){
    $st = explode( '$', $input );
    return (float)str_replace( array(' ',','),array('',''), $st[1] );
}
$url_scrape = $_POST['url_scrape']; 
if( $url_scrape == '' )
    return; 

$BrowsebyLetter = file_get_html( $url_scrape );
$links = $BrowsebyLetter->find('.Results a');

?>
<h1 id="patient">Please be patient while scraping data</h1>
<div id="scrape-progress">
    <div id="scrape-progress-ctx">0%</div>
</div>
<br />
<br />
<br />
<div id="progress-txt"></div>
<br />
<br />
<button id="retry" onclick="iframe.src = ">Retry if not continue</button>
<iframe src="" id="cacheLoad"></iframe>
<script type="text/javascript">
    var total = <?php echo count($links); ?>;
    var ctx = document.getElementById('scrape-progress-ctx');
    var iframe = document.getElementById('cacheLoad');
    var prx = document.getElementById('progress-txt');
    var pt = document.getElementById('patient');
    var retry = document.getElementById('retry');
    var currentLink = '';
    var links = [
<?php
    foreach( $links as $link ){
        echo "'".$link->href."',";
    }
?>'Complete scrape <?php echo count($links); ?> links'  ];
    function progress( cur ){
        ctx.style.width = Math.ceil((cur/total)*100)+'%';
        ctx.innerHTML = Math.ceil((cur/total)*100)+'%';
    };
    function exe( i ){
        progress( i );
        if( links[i] != 'Complete <?php echo count($links); ?> links' )
        {
            currentLink = window.location+'&target='+links[i].split('Job=')[1]+'&cou='+(i+1);
            iframe.src = currentLink;
        };  
        if( i==total ){
            pt.innerHTML = 'Successful';
            pt.style.color = 'green';
            retry.style.display = 'none';
            alert('Scrape process is complete');
        };  
        prx.innerHTML = '<strong>Status: </strong>'+ links[i];
    };
    exe( 0 );
</script>

尝试将其添加到循环所在的位置：

    var links = [
<?php
    $a = 0;
    foreach( $links as $link ){
        $a++;
        if(($a > 50) && ($a < 100)){
            echo "'".$link->href."',";
        }
    }
?>

它会检查链接是否在50到100之间，如果是，它会打印出来。希望我能帮上忙：）

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