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       最近在做报表开发的时候,由于有一个报表是查的交易流水表,所以导致页面出来的有点慢,于是就想着在页面显示之前,加一个页面,告诉用户页面正在加载,提高友好性。

       在网上搜了很多资料之后,决定使用pace.js这个控件来实现,pace.js的使用非常简便,只需调用几个API即可,里面也提供了很多css效果供选择,自己在本地测试项目中测试了一下,确实可用。网上的教程大多推荐使用pace.start和pace.done来完成调用,但我发现pace自带的示例里面,有更简单的调用方法,代码如下:

  <link rel="stylesheet" href="../themes/pace-theme-barber-shop.css">  <script>    paceOptions = {      elements: true    };  </script>  <script src="../pace.js"></script>  <script>    Pace.on('hide', function(){      console.log('done');    });  </script>

          使用pace.start和pace.done方法,需要在document.ready中调用pace.start,在window.onload中调用pace.done,由于我对jQuery不是很熟,于是又在网上找了一段可以通过js实现document.ready的代码,如下:
(function () {  var ie = !!(window.attachEvent && !window.opera);  var wk = /webkit\/(\d+)/i.test(navigator.userAgent) && (RegExp.$1  1) return;    if (ie)      (function () {        try { d.documentElement.doScroll('left'); run(); }        catch (err) { setTimeout(arguments.callee, 0); }      })();    else if (wk)      var t = setInterval(function () {        if (/^(loaded|complete)$/.test(d.readyState))          clearInterval(t), run();      }, 0);  };})();
不过令人心塞的是,这么好的方法,在迁移到具体的报表环境里去之后,却一直报错,提示pace.js里面的一个方法不能使用,由于对所使用的报表系统的框架和pace的实质都不是很清楚,也没有那么多精力去钻研这个,不得已只有放弃。

但这个放弃,其实反而是件好事,因为经过仔细思考之后,我发现我的需求仅仅只是告诉客户我的页面正在加载,不需要非常详细的进度显示,那其实就可以首先将报表页面指向一个load页面,这个页面什么都不做,只显示一个load的gif图片,然后在body里面配置一下onload,代码如下:

 这样,选择这张报表之后,就会先显示load页面,当真正的报表页面加载完成之后,就会自动覆盖掉load页面。这个方法虽不能精确的显示页面加载进度,但是使用方便,且适配性强,不用考虑框架和浏览器的兼容性。    

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