摘要：一行HTML5代碼能做什么？國外開發者Jose Jesus Perez Aguinaga寫了一行HTML5代碼的文本編輯器。這件事在分享到Code Wall、Hacker News之后，引起了眾多開發者的注意，紛紛發表了自己的創意。
但是功能十分有限，甚至沒有保存功能，樣式也非常簡陋。
但bgrins依舊覺得不夠好看，繼續修改代碼，這段代碼會在你打字的時候改變“編輯器”的背景顏色，非常絢麗：
這是最初的HTML5代碼，它可以運行在最新的Chrome和Firefox中，只需在瀏覽器地址欄輸入如下代碼：
| 1 | data:text/html, <html contenteditable> |
于是，網友Montas修改了他的代碼，使用textarea標簽代替html標簽，可以添加自己喜歡的樣式：
| 1 | data:text/html, <textarea style="font-size: 1.5em; width: 100%; height: 100%; border: none; outline: none" autofocus /> |
| 1 2 3 4 5 6 7 8 | 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;"> |
網友jecxjo希望能有存儲功能：
| 1 | 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> |
但上面的代碼是以文件形式存儲，samsonjs覺得不夠方便，而且需要點擊按鈕，于是添加了自動保存功能：
| 1 | 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> |
現在可是云時代！僅僅這樣怎能讓開發者止步？minikomi使用了第三方API打造了一個 在線編輯器：
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | 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> |
沒有代碼高亮功能的編輯器終究不適合程序員，Rails開發者jakeonrails又定制了Ruby代碼高亮功能：
| 1 | 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> |
效果如下圖：
實際上，如果minikomi的代碼已經支持多種語言高亮，如Python，只需要把“markdown”換成“python”，效果如下： 
你以為到此為止了？中國開發者assassindesign覺得只是文本編輯器就太無聊了，又提供了涂鴉版本：
| 1 | data:text/html, <body><canvas id="dyDraw">你的瀏覽器不支持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> |
效果如下：
極客的創意的無窮的，各位讀者，你們是否有更好的創意，歡迎跟帖！
