动态加载css,js

function dynamicLoadCss(url) {
    var head = document.getElementsByTagName('head')[0];
    var link = document.createElement('link');
    link.type='text/css';
    link.rel = 'stylesheet';
    link.href = url;
    head.appendChild(link);
}

function dynamicLoadJs(url) {
    var head = document.getElementsByTagName('head').item(0);
    var script= document.createElement("script");
    script.type = "text/javascript";
    script.src="test.js";
    head.appendChild( script);
}