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php如何调用js方法

Jun 23, 2016 pm 01:46 PM
php

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>
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在test_json2.php中有这样一段PHP代码:

<?php  
$php_test=&#39;I come from PHP!&#39;;  
echo "var test=&#39;$php_test&#39;;";  
echo "var jstext="."&#39;$php_test&#39;;";   
?>
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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>";  
?>
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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=&#39;text/javascript&#39;>test();</script>"; ?>
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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; ?>">
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(2)

<?php  
    $url = &#39;CALL_ME_WHY&#39;;    //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>
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5 、JS调用PHP函数

<script language="JavaScript">  
    var Y=<?php echo date(&#39;Y&#39;)?>,M=<?php echo date(&#39;n&#39;)?>,D=<?php echo date(&#39;j&#39;)?>;  
    alert(Y);  
   alert(M);  
    alert(D);  
</script>
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