The effects may be as simple as a page not loading or a form not saving, or could also be something hard to detect or only shows up under certain circumstances.
这些影响可能小到只是影响某个页面的加载或表单保存，也可能是产生难以检测的问题，或者产生只在特定条件下才会出现的错误。
This reduces the effects of delays imposed by script loading on other page components.
这样可以减少因为载入script而造成其他页面内容载入也被延迟的问题。
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