It’s definitely worth reading, haha. I have completed it myself, please point out any mistakes:
Nowadays mobile phones perfectly support HTML5, so if you want to make a lottery module on the mobile phone, use the scratch card lottery effect. I believe this interactive experience will be great
ps: Since I don’t have a mobile phone with wp8 system, it is not compatible with wp8 system. It is currently perfectly compatible with android and IOS
If you want to browse on PC, you have to change js. Currently, it supports Google, Firefox, and ie>=10 , if netizens want it, I will write a
code as follows:
eraser effect</title> ; <BR><script type="text/javascript" src="jquery.core.js"></script> <br><style> <br>#canvas { <br>background:url( winning-ticket.jpg);<!--Prize image--> <br>width: 531px; <br>height: 438px; <br>} <br>.before{ <br>background:none !important ; <br>} <br>#canvas canvas { <br>cursor: url("hand.png") 0 0, auto;<!--gesture image on PC--> <br>} <br> </style> <br></head> <br><body oncontextmenu="return false;" onselectstart="return false;"> <br><div id="canvas">< /div> <br></body> <br><script type="text/javascript"> <br>(function() { <br>window.onload = function(){ <br>/* *Determine whether the browser supports canvas**/ <br>try{ <br>document.createElement('canvas').getContext('2d'); <br>}catch(e){ <br>var addDiv = document.createElement(' div'); <br>alert('Your mobile phone does not support the scratch card effect~!'); <br>} <br>}; <br>var u = navigator.userAgent,mobile = ''; <br>if(u.indexOf('iPhone') > -1) mobile = 'iphone'; <br>if(u.indexOf('Android') > -1 || u.indexOf('Linux') > -1) mobile = 'Android'; <br>function createCanvas(parent, width, height) { <br>var canvas = {}; <br>canvas.node = document.createElement('canvas'); <br>canvas.context = canvas.node.getContext('2d'); <br>canvas.node.width = width || 100; <br>canvas.node.height = height || 100; <br>parent. appendChild(canvas.node); <br>return canvas; <br>} <br>function init(container, width, height, fillColor, type) { <br>var canvas = createCanvas(container, width, height); <br>var ctx = canvas.context; <br>// define a custom fillCircle method <br>ctx.fillCircle = function(x, y, radius, fillColor) { <br>this.fillStyle = fillColor; <br>this .beginPath(); <br>this.moveTo(x, y); <br>this.arc(x, y, radius, 0, Math.PI * 2, false); <br>this.fill(); <br>}; <br>ctx.clearTo = function(fillColor) { <br>ctx.fillStyle = fillColor; <br>ctx.fillRect(0, 0, width, height); <br>}; <br> ctx.clearTo(fillColor || "#ddd"); <br>canvas.node.addEventListener("touchstart",function(e){ <br>canvas.isDrawing = true; <br>},false); <br>canvas.node.addEventListener("touchend",function(e){ <br>canvas.isDrawing = false; <br>},false); <br>canvas.node.addEventListener("touchmove",function(e) { <br>if (!canvas.isDrawing) { <br>return; <br>} <br>if(type == 'Android'){ <br>var x = e.changedTouches[0].pageX - this .offsetLeft; <br>var y = e.changedTouches[0].pageY - this.offsetTop; <br>}else{ <br>var x = e.pageX - this.offsetLeft; <br>var y = e. pageY - this.offsetTop; <br>} <br>var radius = 20; <br>var fillColor = '#ff0000'; <br>ctx.globalCompositeOperation = 'destination-out'; <br>ctx.fillCircle(x , y, radius, fillColor); <br>},false); <br>} <br>var container = document.getElementById('canvas'); <br>init(container, 531, 438, '#ff0000' , mobile); <br>})(); <br></script> <br></html> <br>
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