js does not jump to pass value php

Everyone knows that if a JS variable wants to obtain the PHP variable sent from the background, it can be written like this:

<?php 
$aaa = &#39;111&#39;;
?>
var aaa = <?php 
echo $aaa;
?>;

Then how do we pay the value of the JS variable directly to the PHP variable? Woolen cloth?

The first method is also the most common method:

No refresh: use ajax to pass parameters;

With refresh: submit directly with the form Or directly follow the jump link;

The second value-passing method:

The example is date processing for js variables:

$c = "<script>document.write(leaderTask_info[&#39;end_time&#39;]);</script>";
echo formatTime($c);//leaderTask_info[&#39;end_time&#39;]是js变量
/**
* 将截止时间秒数转换为日期制
*/
function formatTime($date){
  $t = $date - time();
  $f = array(
    &#39;31536000&#39;=>&#39;年&#39;,
    &#39;2592000&#39;=>&#39;个月&#39;,
    &#39;604800&#39;=>&#39;星期&#39;,
    &#39;86400&#39;=>&#39;天&#39;,
    &#39;3600&#39;=>&#39;小时&#39;,
    &#39;60&#39;=>&#39;分钟&#39;,
    &#39;1&#39;=>&#39;秒&#39;
  );
  foreach($f as $k=>$v){
    $c = floor($t/(int)$k);
    if($c > 0){
      if(0 != $c){
        return "剩余".$c.$v;
      }
    }
  }
  return "已截止";
}

In this way, the value of the js variable can be assigned to the php variable without using ajax and jump.

Recommended tutorial: js video tutorial

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