【发布时间】：2017-11-30 16:58:04
【问题描述】：
是否可以附加onclick事件来左右移动对象img。
按钮为占位符，顺序为左下右。
我面临两个问题：-
1. 我的宽度是500px，即使我在250px 绘制它。它没有居中。
2.我尝试了多种方法将onclick功能添加到-/+y-axis和x-axis。
我什至尝试过适应这段代码：
http://www.authorcode.com/how-to-move-an-object-on-the-html5-canvas/
但也没有运气。 有什么我想念的吗？我在 google 上查过的主要是 keyevent 处理程序。
JSBIN：
http://jsbin.com/wuseguvuka/2/edit?html,css,output
CSS：
@charset "utf-8";
/* Global Styles */
#main {
width:100%;
background-color:red;
}
body {
margin-left: auto;
margin-right: auto;
width: 92%;
max-width: 960px;
padding-left: 2.275%;
padding-right: 2.275%;
}
/* Header */
header {
text-align: center;
display: block;
}
header .profileLogo .logoPlaceholder {
background-color: white;
color:black;
width: 300px;
text-align: center;
}
header .logoPlaceholder span {
width: 180px;
height: 22px;
font-family: 'Montserrat', sans-serif;
color: black;
font-size: 30px;
font-weight: 700;
line-height: 53px;
}
header .logoPlaceholder2 span {
width: 180px;
height: 22px;
font-family: 'Montserrat', sans-serif;
color: black;
font-size: 30px;
font-weight: 700;
line-height: 53px;
}
header .profilePhoto {
background-color: rgba(237,237,237,1.00);
width: 259px;
border-radius: 50%;
height: 259px;
clear: both;
}
header .profileHeader h1 {
font-family: 'Montserrat', sans-serif;
color: rgba(146,146,146,1.00);
font-size: 30px;
font-weight: 700;
line-height: 24px;
}
header .profileHeader h3 {
font-family: sans-serif;
color: rgba(146,146,146,1.00);
font-size: 16px;
font-weight: 700;
line-height: 24px;
}
hr {
background-color: rgba(208,207,207,1.00);
height: 1px;
}
header .profileHeader p {
font-family: sans-serif;
color: rgba(146,146,146,1.00);
font-size: 14px;
font-weight: 400;
line-height: 1.8;
overflow-y: auto;
}
header .socialNetworkNavBar {
text-align: center;
display: block;
margin-top: 60px;
clear: both;
}
header .socialNetworkNavBar .socialNetworkNav {
border-radius: 50%;
cursor: pointer;
}
header .socialNetworkNavBar .socialNetworkNav img:hover {
opacity: 0.5;
}
/* Media query for Mobile devices*/
@media only screen and (min-width : 285px) and (max-width : 480px) {
/* Header */
#main {
width:100%;
}
header {
width: 100%;
float: left;
}
.wrapper {
display: inline-block;
width: 100%;
height: 100%;
}
header .profileLogo .logoPlaceholder {
display: inline-block;
text-align: left;
}
header .profilePhoto {
display: inline-block;
}
header .profileHeader {
text-align: center;
margin-top: 10%;
}
header .profileHeader p {
text-align: justify;
}
header .socialNetworkNavBar {
text-align: center;
display: block;
margin-top: 60px;
clear: both;
margin-bottom: 15%;
}
header .socialNetworkNavBar .socialNetworkNav {
width: 60px;
height: 60px;
display: inline-block;
margin-right: 23px;
}
}
/* Media Query for Tablets */
@media only screen and (min-width : 481px) and (max-width : 1024px) {
/* Header */
header {
width: 100%;
float: none;
}
header .profileLogo .logoPlaceholder {
display: inline-block;
font-family: 'Montserrat', sans-serif;
}
header .profilePhoto {
float: left;
clear: both;
margin-right: 3%;
margin-top: 5%;
}
header .profileHeader {
text-align: left;
margin-top: 7%;
}
header .socialNetworkNavBar .socialNetworkNav {
width: 74px;
height: 74px;
display: inline-block;
margin-right: 23px;
}
}
/* Desktops and laptops */
@media only screen and (min-width:1025px) {
/* Header */
header .profileLogo .logoPlaceholder {
float: left;
margin-bottom: 50px;
}
header .profilePhoto {
float: left;
clear: both;
margin-right: 3%;
}
header .profileHeader {
text-align: left;
padding-top: 10%;
}
header .socialNetworkNavBar .socialNetworkNav {
width: 74px;
height: 74px;
display: inline-block;
margin-right: 23px;
}
.wrapper {
display: table;
padding: 0;
width: 100%;
height: 100%;
}
.container {
display: table-cell;
vertical-align: middle;
}
.canvas-container {
position: relative;
max-width: 1024px;
min-width: 120px;
margin: 0 auto;
}
}
HTML：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>About Page template By Adobe Dreamweaver CC</title>
<link href="AboutPageAssets/styles/aboutPageStyle.css" rel="stylesheet" type="text/css">
<!--The following script tag downloads a font from the Adobe Edge Web Fonts server for use within the web page. We recommend that you do not modify it.-->
<script>var __adobewebfontsappname__="dreamweaver"</script><script src="http://use.edgefonts.net/montserrat:n4:default;source-sans-pro:n2:default.js" type="text/javascript"></script>
<script>
function load() {
var context = document.getElementById('main').getContext("2d");
var img = new Image();
img.src = "http://via.placeholder.com/75x150";
img.onload = function () {
context.drawImage(img, 250, 0);
}
}
</script>
</head>
<body onload="load();">
<!-- Header content -->
<header>
<div class="profileLogo">
<!-- Profile logo. Add a img tag in place of <span>. -->
<p class="logoPlaceholder"><!-- <img src="logoImage.png" alt="sample logo"> --><span>Name :</span></p>
<p class="logoPlaceholder"><!-- <img src="logoImage.png" alt="sample logo"> --><span>Attempts :</span></p>
<p class="logoPlaceholder"><!-- <img src="logoImage.png" alt="sample logo"> --><span>Score :</span></p>
</div>
<section>
<div class="wrapper">
<div class="container">
<div class="canvas-container">
<canvas id="main" width="500px" height="250px"></canvas>
</div>
</div>
</div>
</section>
<!-- Links to Social network accounts -->
<aside class="socialNetworkNavBar">
<div style="margin-right: 50px;" class="socialNetworkNav">
<!-- Add a Anchor tag with nested img tag here -->
<input type="image" src="http://via.placeholder.com/75x75" >
</div>
<div id="left" style="margin-right: 50px;" class="socialNetworkNav">
<!-- Add a Anchor tag with nested img tag here -->
<input type="image" src="http://via.placeholder.com/75x75" > </div>
<div id="down" style="margin-right: 50px;" class="socialNetworkNav">
<!-- Add a Anchor tag with nested img tag here -->
<input id="right" type="image" src="http://via.placeholder.com/75x75" >
</div>
</aside>
</header>
<!-- content -->
</body>
</html>
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标签： javascript jquery html html5-canvas