是的你可以. (很抱歉回答我自己的问题,我认为这是一个有趣的解决方案)

我在幻灯片#12上找到了代码示例的大纲.

我已经在http://m.bbref.com/实现了这一点(仍处于测试阶段)

在创建新版本时,您必须使用脚本URL的版本控制来刷新缓存,但这适用于具有localStorage的页面,并且在localStorage不可用时也可以使用.我在页脚中添加了一些调试代码,以显示js的加载位置.

我把它分成了一个标题和一个页脚的脚本.这些内联显示.

在标题中(我把它放在这里,因为我们使用modernizr将一些类添加到html标记中,我希望那些尽可能快地用于渲染目的.可以移动到页脚.

// .001 is the current js version

// this script assumes it is in the root web directory.

var js_file = "site_lib.001.js";

// vars to store where the file is loaded from.

var _mob_load_js = false;

var _mob_ajax_load_js = false;

{

// if we have localStorage and the files exists there get it.

if(window.localStorage && window.localStorage[js_file]) {

// eval the js file.

try{

window.eval(window.localStorage[js_file]);

// successfully eval'ed the code, so

// we don't need to download it later.

_mob_load_js = true;

} catch (e) { _mob_load_js = false; }

}

else if (window.localStorage) {

// We have localStorage, but no cached file, so we

// load the file via ajax, eval it and then store

// the file in localStorage

// To remove previous versions, I remove all of our localStorage,

// This is extreme if we store other vars there.

window.localStorage.clear();

// standard ajax request.

var xhr = new XMLHttpRequest();

xhr.onreadystatechange = function() {

if (xhr.readyState == 4) {

// eval the js

try {

window.eval(xhr.responseText);

// successfully eval'ed the code, so

// we don't need to download it later.

_mob_ajax_load_js = true;

} catch (e) { _mob_ajax_load_js = false; }

try {

// store the js.

window.localStorage[js_file] = xhr.responseText;

} catch (e) {}

}

else {

return;

}

};

xhr.open("GET",js_file,true);

xhr.send();

}

};

并在页脚中(出于性能原因).我放置标准加载方法.请注意,只要您设置了过期标头,使用此分支的浏览器都会正确缓存.

// We haven't loaded the js yet, so we create a script

// tag and get the script the old fashioned way

if (!_mob_load_js && !_mob_ajax_load_js) {

var script=document.createElement("script");

script.type="text/javascript";

script.src=js_file;

document.getElementById("sr_external_script").appendChild(script);

// add a note to the footer

document.write('

');

}

else if (!_mob_load_js) {

// add a note to the footer

document.write('

');

}

else {

// add a note to the footer

document.write('

');

}

我已经在chrome和safari中确认js是从localStorage加载的,并且站点功能按预期工作,并且没有向服务器发出请求.我已经确认,当在IE或Firefox上运行时,它会加载脚注中的脚本.

注意：我添加了代码来包装try catch中的evals,因为我在firefox中遇到了问题.