[英]JavaScript execution
I have two scripts, which are included in the HTML body. 我有两个脚本,它们包含在HTML正文中。 In the first script I'm initializing a JS-Object which is referenced in the second script tag.
在第一个脚本中,我正在初始化第二个脚本标记中引用的JS-Object。
<body>
...
<script type="text/javascript" src="http://url/script.js"></script>
<script type="text/javascript">
obj.a = 1000;
obj.do();
</script>
</body>
What is happening, if loading time of the first script (via HTTP) is slow? 如果第一个脚本(通过HTTP)的加载时间很慢,会发生什么? How is the execution order of the JS in the body?
JS的执行顺序如何?
<script>
tags within page source are executed synchronously together with the page load. 页面源中的
<script>
标记与页面加载一起同步执行。
The browser will not parse or render any HTML after the <script>
tag until the script finishes downloading and executing. 浏览器不会在
<script>
标记之后解析或呈现任何HTML,直到脚本完成下载和执行。
This is why it's better to move all <script>
tags to the bottom of the page, so that the HTML is rendered first. 这就是为什么最好将所有
<script>
标记移动到页面底部,以便首先呈现HTML。
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