JavaScript子串返回错误

问题描述：

I am using Joomla and attempting to use the substring() function to pull out the first 4 characters of my string. The issue I am having is that I get an error of

This is my syntax - how should I change it so that it functions in my Joomla set-up?

Uncaught TypeError: phpdate.substring is not a function

Here is syntax:

<?php
  $randardate = '20160301';
?>
<script>
  var phpdate = <?php echo $randardate; ?>;
  var yearfromphpdate = phpdate.substring(0,4);
</script>

我正在使用Joomla并尝试使用substring（） code>函数来取出我的字符串的前4个字符。我遇到的问题是我收到错误 p>

这是我的语法 - 如何更改它以使其在我的Joomla设置中起作用？ p>


 
 未捕获的TypeError：phpdate.substring不是函数 p> 
  blockquote> 
 
 
这是语法： p> 
 
  ＆lt;？php 
 $ randardate ='20160301'; 
？＆gt; 
＆lt; script＆gt; 
 var phpdate =＆lt;？php echo $ randardate;  ？＆gt ;; 
 var yearfromphpdate = phpdate.substring（0,4）; 
＆lt; / script＆gt; 
  code>  pre> 
  div>

答

Since you are pre processing a javascript file with PHP, without quotes your javascript file would look something like

var phpdate = 20160301;

You need to add quotations like this

var phpdate = '<?php echo $randardate; ?>';

So that when PHP is done processing your file, it will be a string, not an int.

var phpdate = '20160301';

Your stacktrace is being thrown because substring expects a string, not an int.

答

Add quotation to make phpdate a string.

var phpdate = '<?php echo $randardate; ?>';

JavaScript子串返回错误

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