摘要:一行HTML5代码能做什么?国外开发者Jose Jesus Perez Aguinaga写了一行HTML5代码的文本编辑器。这件事在分享到Code Wall、Hacker News之后,引起了众多开发者的注意,纷纷发表了自己的创意。

这是最初的HTML5代码,它可以运行在最新的Chrome和Firefox中,只需在浏览器地址栏输入如下代码:

[cce_html]data:text/html, <html contenteditable>[/cce_html]

但是功能十分有限,甚至没有保存功能,样式也非常简陋。于是,网友Montas修改了他的代码,使用textarea标签代替html标签,可以添加自己喜欢的样式:

[cce]data:text/html, <textarea style="font-size: 1.5em; width: 100%; height: 100%; border: none; outline: none" autofocus />[/cce]

但bgrins依旧觉得不够好看,继续修改代码,这段代码会在你打字的时候改变“编辑器”的背景颜色,非常绚丽:

[cce]
data:text/html, <html><head><link href='http://fonts.googleapis.com/css?family=Open+Sans'
    rel='stylesheet' type='text/css'><style type="text/css"> html
    { font-family: "Open Sans" } * { -webkit-transition: all linear 1s; }</style><script>window.onload=function(){var
    e=false;var t=0;setInterval(function(){if(!e){t=Math.round(Math.max(0,t-Math.max(t/3,1)))}var
    n=(255-t*2).toString(16);document.body.style.backgroundColor="#ff"+n+""+n},1e3);var
    n=null;document.onkeydown=function(){t=Math.min(128,t+2);e=true;clearTimeout(n);n=setTimeout(function(){e=false},1500)}}</script></head><body
    contenteditable style="font-size:2rem;line-height:1.4;max-width:60rem;margin:0
    auto;padding:4rem;">
[/cce]

网友jecxjo希望能有存储功能:

[cce]data:text/html,<button onClick="SaveTextArea()">Save</button> <script language="javascript" type="text/javascript"> function SaveTextArea() { window.location = "data:application/octet-stream," + escape(txtBody.value); } </script> <textarea id="txtBody" style="font-size: 1.5em; width: 100%; height: 100%; boarder: none; outline: none" autofocus> </textarea>[/cce]

但上面的代码是以文件形式存储,samsonjs觉得不够方便,而且需要点击按钮,于是添加了自动保存功能:

[cce]data:text/html,<html lang="en"><head><style> html,body { height: 100% } #note { width: 100%; height: 100% } </style> <script> var note, html, timeout; window.addEventListener('load', function() { note = document.getElementById('note'); html = document.getElementsByTagName('html')[0]; html.addEventListener('keyup', function(ev) { if (timeout) clearTimeout(timeout); timeout = setTimeout(saveNote, 100); }); restoreNote(); note.focus(); }); function saveNote() { localStorage.note = note.innerText; timeout = null; } function restoreNote() { note.innerText = localStorage.note || ''; } </script> </head><body><h1>Notepad (type below, notes persist)</h1> <p id="note" contenteditable=""></p> </body></html>[/cce]

现在可是云时代!仅仅这样怎能让开发者止步?minikomi使用了第三方API打造了一个 在线编辑器

[cce]
data:text/html,
<style type="text/css">
#e {
  position:absolute;
  top:0;
  right:0;
  bottom:0;
  left:0;
  font-size:16px;
}
</style>
<div id="e"></div>
<script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js"></script>
<script src="http://code.jquery.com/jquery-1.9.0.min.js"></script>
<script>
var myKey="SecretKeyz";
$(document).ready(function(){
    var e;
    var url = "http://api.openkeyval.org/"+myKey;
    $.ajax({
      url: url,
      dataType: "jsonp",
      success: function(data){
       e = ace.edit("e");
       e.setTheme("ace/theme/tomorrow_night_eighties");
       e.getSession().setMode("ace/mode/markdown");
       e.setValue(data);
      }
    });
  
    $("#e").on("keydown", function (b) {
      if (b.ctrlKey && 83 == b.which) {
        b.preventDefault();
        var data = myKey+"="+encodeURIComponent(e.getValue());
        $.ajax({
          data: data,
          url: "http://api.openkeyval.org/store/",
          dataType: "jsonp",
          success: function(data){
            alert("Saved.");
          }
        });
      }
    });
});
</script>
[/cce]

没有代码高亮功能的编辑器终究不适合程序员,Rails开发者jakeonrails又定制了Ruby代码高亮功能:

[cce]data:text/html, <style type="text/css">#e{position:absolute;top:0;right:0;bottom:0;left:0;}</style><div id="e"></div><script src="http://d1n0x3qji82z53.cloudfront.net/src-min-noconflict/ace.js" type="text/javascript" charset="utf-8"></script><script>var e=ace.edit("e");e.setTheme("ace/theme/monokai");e.getSession().setMode("ace/mode/ruby");</script>[/cce]

效果如下图:

实际上,如果minikomi的代码已经支持多种语言高亮,如Python,只需要把“markdown”换成“python”,效果如下:

你以为到此为止了?中国开发者assassindesign觉得只是文本编辑器就太无聊了,又提供了涂鸦版本:

[cce]data:text/html, <body><canvas id="dyDraw">你的浏览器不支持HTML5 Canvas</canvas></body><script>function $(id){return document.getElementById(id);} $('dyDraw').width=document.body.clientWidth;$('dyDraw').height=document.body.clientHeight;if(window.addEventListener){window.addEventListener('load',function(){var canvas,canvastext;var hua=false;function dyDrawing(){canvas=$('dyDraw');canvastext=canvas.getContext('2d');canvas.addEventListener('mousedown',canvasMouse,false);canvas.addEventListener('mousemove',canvasMouse,false);window.addEventListener('mouseup',canvasMouse,false);} function canvasMouse(dy){var x,y;if(dy.layerX||dy.layerX==0){x=dy.layerX;y=dy.layerY;}else if(dy.offsetX||dy.offsetX==0){x=dy.offsetX;y=dy.offsetY;} x-=dyDraw.offsetLeft;y-=dyDraw.offsetTop;if(dy.type=='mousedown'){hua=false;canvastext.beginPath();canvastext.moveTo(x,y);hua=true;}else if(dy.type=='mousemove'){if(hua){canvastext.strokeStyle="rgb(255,0,0)";canvastext.lineWidth=9;canvastext.lineTo(x,y);canvastext.stroke();}}else if(dy.type=='mouseup'){hua=false;}} dyDrawing();},false);}</script>[/cce]

效果如下:

极客的创意的无穷的,各位读者,你们是否有更好的创意,欢迎跟帖!