什么是更好的做法:eval或append脚本? [英] What's the better practice: eval or append script?
问题描述
我需要执行一些自定义的JavaScript,我从一些AJAX调用得到。我可以做一个 eval
的字符串,或者我可以把它附加到一个脚本
-tag到DOM。哪种方法会更好?
I need to execute a custom piece of JavaScript I got from some AJAX call. I could do an eval
of the string or I could just append it in a script
-tag to the DOM. Which method would be better?
var dynamicScript = 'alert(\'Hello world!\');';
方法1 - 脚本:
var x = '<script type="text/javascript">' + dynamicScript +'</scr' + 'ipt>';
$(document.body).append(x);
方法2 - 评估:
eval(dynamicScript);
什么方法更好,为什么?或者有更好的选择吗?
What method is better and why? Or is there an ever better alternative?
推荐答案
我更喜欢 eval
因为通常比创建脚本标签更快,并附加它(特别是如果你想要使用jQuery创建和插入它。)
I prefer eval
, because it's generally faster than creating a script tag, and appending it (especially if you wanted to create and insert it using jQuery).
旁注(脚本标签的有用应用程序)我还使用脚本标记插入方法:In因为窗口
对象被沙盒化,所以Google Chrome的扩展程序,注入脚本标签是在页面范围内运行代码的唯一方法。
Side note (useful application of a script tag) I also use the script-tag-insertion method: In Google Chrome's extensions, injecting script-tags is the only way to run code in the scope of a page, because the window
object is sandboxed.
PS。 jQuery.getScript()
的概念。此方法可能很有用。
PS. Notion of jQuery.getScript()
. This method might be useful.
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