没啥说的，直接上代码
export default class CssUtil {
static addCssCode(parentNode,code){
let style = parentNode.getElementsByTagName('style')[0]
if(!style){
style = document.createElement('style')
style.type = 'text/css'
style.rel = 'stylesheet'
parentNode.insertBefore(style,parentNode.firstChild)
}
//for Chrome Firefox Opera Safari
style.appendChild(document.createTextNode(code));
}
}
