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[网页设计]html5 canvas在线文本第二步设置(字体边框)等我全部写完,我会写在页面底部


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html ="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>html5 canvas文本处理</title><script src="js/modernizr.js"></script></head><body><script type="text/javascript">window.addEventListener('load',eventWindowLoaded,false);function eventWindowLoaded(){  canvasApp();}function canvasSupport(){  return Modernizr.canvas;}function eventWindowLoader(){  canvasApp();}function canvasApp(){  var message="JourneyYao";  var fillOrStroke ="fill";    if(!canvasSupport()){    return;  }    var theCanvas = document.getElementById('canvas')  var context = theCanvas.getContext("2d")  var formElement = document.getElementById("textbox")  formElement.addEventListener('keyup',textBoxChanged,false);     var formElement = document.getElementById("fillorstroke")  formElement.addEventListener('change',fillOrStrokeChanged,false);       drawScreen()  function drawScreen(){    context.fillStyle = '#ffffaa';    context.fillRect(0,0,theCanvas.width,theCanvas.height);        context.strokeStyle = '#000';    context.strokeRect(5,5,theCanvas.width-10,theCanvas.height-10);               //字体大小    context.font="50px serif";    var metrics = context.measureText(message);    //字体居中    var textWidth= metrics.width;    var xPosition=(theCanvas.width/2)-(textWidth/2);    var yPosition=(theCanvas.height/2);        //选择类型    switch(fillOrStroke){      case "fill":        context.fillStyle="#ff0000";        context.fillText(message,xPosition,yPosition);        break;      case "stroke":        context.strokeStyle="#000000";        context.strokeText(message,xPosition,yPosition);        break;      case "both":        context.fillStyle="#ff0000";        context.fillText(message,xPosition,yPosition);        context.strokeStyle="#000000";        context.strokeText(message,xPosition,yPosition);        break;            }      }    function textBoxChanged(e){     var target = e.target;     message=target.value;     drawScreen();  }    function fillOrStrokeChanged(e){     var target = e.target;     fillOrStroke=target.value;     drawScreen();  }  }</script><canvas id="canvas" width="500" height="300">你的浏览器无法使用canvas小白童鞋;你的支持是我最大的快乐!!</canvas><form>Text:<input id="textbox" placeholder="your text" /><br />Fill Or Stroke:<select id="fillorstroke"> <option value="fill">fill</option> <option value="stroke">stroke</option> <option value="both">both</option></select></form></body></html>