为什么本地存储在javascript之后保存最后

时间:2010-11-27 20:35:14

标签: javascript html5 upload google-chrome-extension local-storage

我正在尝试在程序加载时将tab.url保存到html5本地存储中,然后根据规则将css文件更新到标题中,这很容易。但由于某种原因,popup.html加载了先前的本地存储变量而不是最近的存储变量。

我想知道是否有人可以帮助我,我使用的代码就是这个;

<script language="javascript">
var rule;
var links;
var search;

function loadcssfile(filename, filetype)
{ 
   if (filetype == "css")
   {   
       var fileref=document.createElement("link");
       fileref.setAttribute("rel", "stylesheet");
       fileref.setAttribute("type", "text/css");
       fileref.setAttribute("href", filename);
   }

   if (typeof fileref != "undefined")
   {   
       document.getElementsByTagName("head")[0].appendChild(fileref);
   }
}

function loaded()
{   
    chrome.tabs.getSelected(null,function(tab) 
    {   
        var temp;
        temp = tab.url;
        localStorage['tab'] = temp;
        console.log(temp);
    });

    links = localStorage['tab'];
    rule = localStorage['ok0'];
    search = links.indexOf(rule);

    if(search != -1)
    {   
        loadcssfile("./css/styles.css","css");
        loadcssfile("./button/styles2.css","css");
    }
    else
    { 
        // or load other css file 
    }
}

document.getElementById('datacontent').innerHTML = rule + "<br>" + links + "<br>" + search;


function createXMLHttpRequest()
{ 
    if (window.ActiveXObject)
    {   
        xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if (window.XMLHttpRequest)
    {   
        xmlHttp = new XMLHttpRequest();
    }
}

function createXMLHttpRequest2()
{  
    if (window.ActiveXObject)
    {   
        xmlHttp2 = new ActiveXObject("Microsoft.XMLHTTP");
    }
    else if (window.XMLHttpRequest)
    {   
        xmlHttp2 = new XMLHttpRequest();
    }
}

function handleStateChange1() 
{ 
   if(xmlHttp.readyState == 4 && xmlHttp.status == 200 ) 
   {   
       var data;
       data = xmlHttp.responseText;
       document.getElementById('container').innerHTML = data;
   }
}

function senddata(id)
{ 
   createXMLHttpRequest();
   xmlHttp.onreadystatechange = handleStateChange1;
   xmlHttp.open("GET", "http://weblinkchecker.forum-source.tk/crawler.php?link=" + links.replace('&','0123456789abcdef'), true);
   xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
   xmlHttp.send("&type=anythinghere&anothervar=datahere");
   document.getElementById(id).innerHTML = "Successful !";
}  

function handleStateChange2() 
{ 
   if(xmlHttp2.readyState == 4 && xmlHttp2.status == 200 ) 
   {   
       var data;
       data = xmlHttp2.responseText;
       document.getElementById('container2').innerHTML = data;
   }
}

function sendForLinks()
{ 
   createXMLHttpRequest2();
   xmlHttp2.onreadystatechange = handleStateChange2;
   xmlHttp2.open("GET", "http://weblinkchecker.forum-source.tk/links.php?link=" + links.replace('&','0123456789abcdef'), true);
   xmlHttp2.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
   xmlHttp2.send("type=anythinghere&anothervar=datahere");
}

window.onload = function()
{ 
   loaded();
}

</script>

正如你可以看到它的一个web链接检查器,有一些我没有上传的css,也有很多使用ajax的php,但没有一个对代码产生影响,我也删除了任何innerHTML功能。很抱歉有这么大的代码。

如果任何人可以告诉我为什么html5本地存储最后保存它将是一个巨大的帮助。我尝试回显数据,它只是提供旧数据而不是最近的数据。我觉得我用这个砖打了一堵砖。

1 个答案:

答案 0 :(得分:1)

首先,您的代码很难阅读,请处理您的编码风格,例如:

  1. 每个缩进使用超过1个空格
  2. 不要在打开和关闭花括号的同一行上放置东西
  3. 使用==!=等处的空格
  4. 这将使您的代码更具可读性:)

    但问你的问题:

    // this looks like a callback....
    chrome.tabs.getSelected(null,function(tab) { 
        var temp;
        temp = tab.url;
        localStorage['tab'] = temp;
        console.log(temp);
    });
    
    // this will most likely get executed BEFORE the callback gets called
    // therefore the values just hasn't been changed yet
    links = localStorage['tab'];
    rule = localStorage['ok0'];
    search = links.indexOf(rule);
    

    您很可能需要将loaded函数的其余部分移动到回调中。