javascript - js变量在PHP中怎么获取该变量?
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>
js中通过post提交到后台:
<code>var data = { 'param' : xxx }; $.post(url,data,callback)</code>
php后台接受数据(此处基于thinkPHP):
<code>$data = I('post.param')</code>
前后台数据通讯用get或post就行了,js中的直接走ajax
$__POST[]
要么AJAX,要么就PHP在页面上输出变量值,JS再去获取
js 代码 ajax 推送到 test.php文件
<code>var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { //此处处理 php 处理后返回的结果 alert(xmlhttp.responseText); } else{ } } xmlhttp.open("GET","test.php?id=10",true); xmlhttp.send(); </code>
php 文件
<code>if(isset($_GET['id'])){ echo '前台js推送过来的变量为:'.$_GET['id']; }</code>
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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