js 改变css样式值

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document.getElementById("a").style.background="red"; 来一项一项的写 
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2、document.getElementById("a").style.cssText="border-collapse:collapse;border-spacing:1;border:1 solid #0B2565;background-color:white;color:black;"

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Changing CSS Values with Javascript

Add Rules to Stylesheets with JavaScript

get document.styleSheets by name instead of index?

change the global CSS so which will effictively change all elements of a peticular style at once

正在整理中