php如何调用js方法
JS调用PHP 和 PHP调用JS的方法举例
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1、JS方式调用PHP文件并取得PHP中的值
举一个简单的例子来说明:
如在页面test_json1中用下面这句调用:
<script type="text/javascript" src="http://callmewhy.sinaapp.com/index.php/test/testjson2"> </script> <script type="text/javascript" > alert(jstext); </script>
在test_json2.php中有这样一段PHP代码:
<?php $php_test='I come from PHP!'; echo "var test='$php_test';"; echo "var jstext="."'$php_test';"; ?>
当执行test_json1.php文件时,就会调用test_json2.php文件,并将b.php文件的输出作为JS语句来执行,
所以此处会弹出一个提示框,内容为JS变量jstext的值,也就是在PHP文件中赋给jstext的值.
小结:在HTML里用JS 调用文件的方式调PHP文件,则PHP文件的输出将会被调用页作为JS的代码来用.
2、PHP调用JS中的值
在test_json3.php页面中有这样一段代码:
<script type="text/javascript" > var data="call_me_why"; </script> <? echo "<script type=text/javascript>document.write(data)</script>"; ?>
3、php调用js中的方法(函数)
和第二种情况基本类似,利用echo脚本来实现JS调用
<script type="text/javascript"> function test() { var t1=3; t1 = t1+2; alert(t1); //return t1; } </script> <?php echo "<script type='text/javascript'>test();</script>"; ?>
4、JS调用PHP变量
(1)
<?php $userId=100; ?> <script> var userId; userId=document.getElementById("userId").value; alert(userId); </script> <input type="text" name="userId" id="userId" value="<?php echo $userId; ?>">
(2)
<?php $url = 'CALL_ME_WHY'; //定义变量 ?> <script type="text/javascript"> //js调用php变量 var ds ="<?php echo $url?>" ; //赋值 alert(ds); //输出效果 </script>
5 、JS调用PHP函数
<script language="JavaScript"> var Y=<?php echo date('Y')?>,M=<?php echo date('n')?>,D=<?php echo date('j')?>; alert(Y); alert(M); alert(D); </script>

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