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HTML5 instances-simple implementation of functions similar to scratch cards

Source: Internet
Author: User
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Note the key settings:

1. Set User scaling: User-scalable=no|yes

The code is as follows Copy Code
<meta name= "viewport" content= "Width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, User-scalable=no "/>


2. Prohibit dragging:

The code is as follows Copy Code
Document.ontouchmove = function (e) {E.preventdefault ();}; Document prohibits Touchmove events


3. Prohibit pop-up selection menu:
The code is as follows Copy Code

Document.documentElement.style.webkitTouchCallout = "None";




Now put the complete code, want to learn the students themselves to test it.
The code is as follows Copy Code


<! DOCTYPE html>

<meta charset= "UTF-8"/>
<meta content= "Width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;" name= "viewport"/>
<title> Zhi Ling Legends </title>
<style type= "Text/css" >
Body {
width:320px;
min-height:568px;
Overflow:hidden;
margin:0;
}
#canvas {
Background:url (img/lzl.jpg);
/* Prize Pictures/*
Fixed Center center no-repeat;
Background-size:cover;
width:320px;
min-height:480px;
Overflow:hidden;
position:relative;
}
. before {
Background:none!important;
}
#canvas Canvas {
Cursor:url ("Img/bird.png") 0 0, auto;
/*PC-End gesture Picture * *
}
</style>

<body oncontextmenu= ' return false; ' onselectstart= ' return false; >
<div id= "Canvas" >
</div>
</body>
<script type= "Text/javascript" >
(function () {

Window.onload = function () {
/** Prohibit drag settings */
Document.ontouchmove = function (e) {
E.preventdefault ();
};

/** to determine if the browser supports canvas**/

try {

Document.createelement (' canvas '). GetContext (' 2d ');

catch (e) {

var adddiv = document.createelement (' div ');

Alert (' Your phone does not support scraping card effect oh ~! ');

}

};

var u = navigator.useragent,
Mobile = ' PC ';

if (u.indexof (' iphone ') >-1) Mobile = ' iphone ';

if (U.indexof (' Android ') >-1 | | u.indexof (' Linux ') >-1) Mobile = ' Android ';

function Createcanvas (parent, width, height) {

var canvas = {};

Canvas.node = document.createelement (' canvas ');

Canvas.context = Canvas.node.getContext (' 2d ');
Here you can add yourself to the label
Canvas.node.width = Width | | 320;

Canvas.node.height = Height | | 480;
Add ID to Canvas label
canvas.node.id = ' Canvastag ';

Parent.appendchild (Canvas.node);

return canvas;

}

function init (container, width, height, fillcolor, type) {

var canvas = Createcanvas (container, width, height);

var ctx = Canvas.context;

Define a custom Fillcircle method

Ctx.fillcircle = function (x, y, radius, fillcolor) {

This.fillstyle = FillColor;

This.beginpath ();

This.moveto (x, y);

This.arc (x, y, radius, 0, Math.PI * 2, false);

This.fill ();

};

Ctx.clearto = function (FillColor) {

Ctx.fillstyle = FillColor;

Ctx.fillrect (0, 0, width, height);

};

Ctx.clearto (FillColor | | "#ddd");

Canvas.node.addEventListener (mobile = "PC"?) "MouseDown": "Touchstart", function (e) {

Canvas.isdrawing = true;

}, False);

Canvas.node.addEventListener (mobile = "PC"?) "MouseUp": "Touchend", function (e) {

Canvas.isdrawing = false;

}, False);

Canvas.node.addEventListener (mobile = "PC"?) "MouseMove": "Touchmove", function (e) {

if (!canvas.isdrawing) {

Return

}

if (type = = ' Android ') {

var x = E.changedtouches[0].pagex-this.offsetleft;

var y = e.changedtouches[0].pagey-this.offsettop;

} else {

var x = E.pagex-this.offsetleft;

var y = e.pagey-this.offsettop;

}

var radius = 20;

var fillcolor = ' #ff0000 ';

ctx.globalcompositeoperation = ' destination-out ';

Ctx.fillcircle (x, y, radius, fillcolor);

}, False);

}

var container = document.getElementById (' canvas ');

Init (container, 568, ' #696868 ', mobile);

})();
</script>

The browsing effect is as follows:

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