asynchronous.js

// 异步加载js
(function(){
    var _asyn_js_data = ['index.js','index1.js','index2.js','index3.js']
    for(var i=0;i<_asyn_js_data.length;i++){
        var script=document.createElement("script");
        script.setAttribute("src", _asyn_js_data[i]);
        var heads = document.getElementsByTagName("head");
        if(heads.length){
            heads[0].appendChild(script);
        }else{
            document.documentElement.appendChild(script);
        }
    }
})();

// 异步加载图片
(function(){
    var _img_src = ['img/img1.png','img/img2.png','img/img3.png']
    var _img = document.getElementsByTagName("img")
    for(var i=0;i<_img.length;i++){
        _img[i].setAttribute("src",_img_src[i]);
    }
})();