无法将脚本元素附加到头部
[英]Can't append script element to head
问题描述
Current variant looks like that (I tried solution offered here: Can't append <script> element ): 
当前变体如下所示（我尝试了此处提供的解决方案： 无法追加<script> element ）：
var s=document.createElement("script");
s.type="text/javascript";
s.src="js/properties.js";
$("head").append(s);
Previous variant was: 先前的变体是：
$("head").append($('<script type="text/javascript" src="js/properties.js"></script>'));
And both of them don't work. 而且它们都不起作用。 "properties.js" is also in "js" folder, but if I remove this part of path, it doesn't change anything. “ properties.js”也位于“ js”文件夹中，但是如果删除路径的这一部分，则不会更改任何内容。 I also tried to use ' instead " and check addBlock: I had it installed, but it's disabled on this page. Changing "append" function to "appendChild" also didn't help. 我也尝试使用'相反的'并检查addBlock：我已经安装了它，但是在此页面上将其禁用。将“ append”函数更改为“ appendChild”也无济于事。
"properties.js" contains just one line: “ properties.js”仅包含一行：
var PREFIX_URL = "http://localhost:8080/app-rest-1.0.0-SNAPSHOT";
And firstly I declare it in "main.js" to which I, in fact, try to connect this file. 首先，我在“ main.js”中声明它，实际上，我尝试将其连接到该文件。 Explain, please, what I'm doing wrong. 请解释一下我在做什么错。
2 个解决方案
解决方案1
0 2016-02-27 19:01:36
Add all your <script> tags right before the closing </body> tag, because when the browser encounters a <script> tag it begins downloading it and stops rendering of the page. 在结束</body>标记之前添加所有<script>标记，因为当浏览器遇到<script>标记时，它将开始下载它并停止呈现页面。 So by placing them at the bottom of the page you make sure your page is fully loaded before trying to interact with the DOM elements. 因此，通过将它们放置在页面底部，可以确保在尝试与DOM元素进行交互之前页面已完全加载。 Also $("head") returns an array of all the <head> tags. $("head")还会返回所有<head>标签的数组。 You should also enclose your calls in a $(document).ready() function. 您还应该将调用包含在$(document).ready()函数中。
<!-- Your html tags here -->
<script type="text/javascript">
$(document).ready(function(){
var s=document.createElement("script");
s.type="text/javascript";
s.src="js/properties.js";
$("head")[0].append(s);
});
</script>
</body>
解决方案2
0 2016-02-27 19:26:22
I made JSBin example . 我以JSBin 为例 。 You can see in console that last script tag is the one you need. 您可以在控制台中看到所需的最后一个脚本标记。 So the your code is correct. 因此，您的代码是正确的。
If your IDE don't highlight 'var' - it may be error not in javascript. 如果您的IDE不突出显示“ var”-可能不是JavaScript的错误。 You can place it in a wrong place for example. 例如，您可以将其放置在错误的位置。
Can you provide link to a gist (or pastie.org or smth) for us to better understand your problem. 您能否提供要点（或pastie.org或smth）的链接，以便我们更好地了解您的问题。
PS The code $("head")[0].append gives me undefined ( note to previous answer) PS代码$（“ head”）[0] .append给我未定义（注意上一个答案）
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