/**
 * 动态加载 css 文件
 * @param {string} url - 需要加载的 css 文件路径
 */
function LoadStyle(url) {
    try {
        document.createStyleSheet(url)
    } catch (e) {
        var cssLink = document.createElement('link');
        cssLink.rel = 'stylesheet';
        cssLink.type = 'text/css';
        cssLink.href = url;
        var head = document.getElementsByTagName('head')[0];
        head.appendChild(cssLink)
    }
}


/**
 * use demo
 */
LoadStyle('./css.css');