JS jquery 引用CSS文件

        $("<link></linl>").attr({
            rel: "stylesheet",
            type: 'text/css',
            href: './css/purchaseMain.css',
        }).insertAfter("head")
        // var head = document.getElementsByTagName('head')[0];
        // var link = document.createElement('link');
        // link.href = './css/purchaseMain.css';
        // link.rel = 'stylesheet';
        // link.type = 'text/css';
        // head.appendChild(link)