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javascript - js变量在PHP中怎么获取该变量?

Jun 06, 2016 pm 08:09 PM
javascript php

在js中定义一个变量,在PHP中怎么获取该变量?(在一个页面)

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在js中定义一个变量,在PHP中怎么获取该变量?(在一个页面)

JS是前端,PHP是后端,后端PHP要获取前端JS的变量,那前端JS可以通过AJAX传输数据给后端PHP.比如登录页面login.php:

<code><?php if (!defined('APP_ROOT')) define('APP_ROOT', './');
require APP_ROOT.'include/common.php'; // 加载functions.php,验证cookie等
//后端PHP使用if处理各种前端JS发出的"事件/操作/请求",处理完成exit退出
if(isset($_GET['action']) && $_GET['action']==='login') {
    if(isset($_POST['name'])
    && isset($_POST['pass'])
    && $_POST['name']==='ele'
    && $_POST['pass']===123) {
        $ret['num'] = 0;
        $ret['txt'] = '登录成功';
        echo json_encode($ret);
        exit();    
    } else {
        $ret['num'] = 1;
        $ret['txt'] = '登录失败';
        echo json_encode($ret);
        exit();    
    }
}
?>

<?php //下面的 "header.php + 登录表单 + footer.php" 可以考虑写一个render函数加载,从而分离界面和上面的逻辑
require 'header.php';
?>

<?php //下面显示登录表单(PHP+HTML+AJAX)
?>
<script src="<?php%20echo%20%24app%5B'theme_dir'%5D;%20?>/js/jquery.js"></script>
<script>
//给登录按钮绑定点击事件
$('.con').on('click', '.login', function(){
    $(this).text('正在登录');
    var context = this;
    $.ajax(
        url: 'login.php?action=login',
        type: 'POST',
        //这里就是JS传输给PHP的变量,可以通过DOM获取
        data: 'name='+$('.name').val()+'&pass='+$('.pass').val(),
        success: function(data){
            var obj = $.parseJSON(data);
            console.log(obj);
            //JS根据PHP返回值进行相应操作
            if(obj.num==0) {
                $(context).text(obj.txt);
                setTimeout(function(){
                    //1秒后跳转到首页
                    window.location.href = '/';
                }, 1000);
            } else {
                $(context).text(obj.txt);
                setTimeout(function(){
                    $(context).text('登录');
                }, 1000);
            }
        }
    );
});
</script>

<?php require 'footer.php';
?></code>
Copy after login

js中通过post提交到后台:

<code>var data = {
   'param' : xxx
};
$.post(url,data,callback)</code>
Copy after login

php后台接受数据(此处基于thinkPHP):

<code>$data = I('post.param')</code>
Copy after login

前后台数据通讯用get或post就行了,js中的直接走ajax

$__POST[]

要么AJAX,要么就PHP在页面上输出变量值,JS再去获取

js 代码 ajax 推送到 test.php文件

<code>var xmlhttp; 
if (window.XMLHttpRequest) 
 {// code for IE7+, Firefox, Chrome, Opera, Safari 
 xmlhttp=new XMLHttpRequest(); 
 } 
else
 {// code for IE6, IE5 
 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
 } 
 
 
xmlhttp.onreadystatechange=function() 
 { 
 if (xmlhttp.readyState==4 && xmlhttp.status==200) 
  { 
  //此处处理  php 处理后返回的结果
  alert(xmlhttp.responseText);

  
  }  else{
      

  }
 } 
xmlhttp.open("GET","test.php?id=10",true); 
xmlhttp.send(); </code>
Copy after login

php 文件

<code>if(isset($_GET['id'])){
echo '前台js推送过来的变量为:'.$_GET['id'];
}</code>
Copy after login

如果是提交表单的话,好吧 ,其实大部分是将js里面的数据绑定在一个html的input中,将这个input隐藏起来,然后提交表单的时候就可以一起提交过去了~

好像大家都没有理解楼主的意思,据我所知,在不提交的情况下是实现不了吧,不过反过来js可以获取PHP输出的值。

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