canvas implements the code used to upload user avatars on the mobile phone
Without further ado, let me introduce to you the canvas implementation code for uploading user avatars on the mobile phone. The specific code is as follows:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
label{
height:40px;
width:100px;
border:1px solid #666;
display:block;
text-align:center;
line-height:40px;
border-radius:10px;
background:lightgreen;
opacity: 1;
}
input{
display:none;
}
span{
display:block;
height:100%;
width:100%;
}
#canvas {
border:1px solid #666;
}
</style>
<script src="js/jquery-1.11.3.js"></script>
</head>
<body>
<label>
<input type="file" id="file" />
<span>上传文件</span>
</label>
<canvas width="300" height="300" id="canvas"></canvas>
</body>
<script>
$("#file").change(function (){
var file = new FileReader();//读取文件2进制
file.onload = function(e){
var base64 = e.target.result;
var img = new Image();//创建一个图片对象
img.onload = function (){
var canvas = $("#canvas").get(0);
var ctx = canvas.getContext("2d");
//使用drawImage显示图片
ctx.drawImage(img,0,0,canvas.width,canvas.height);
}
//把base64添加到图片上
img.src = base64;
};
file.readAsDataURL(this.files[0]);
});
</script>
</html>
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