<!Doctype html>
<html>
<head>
<meta charset="utf-8" />
<title>H5 Js图片转base64编码</title>
<style type="text/css">
.a{
border:1px solid #ccc;
}
.b{
border-color:#fff;
}
.c{
float:left;
}
.d{
clear:both;
}
</style>
</head>
<body>
<div >
<span>图片属性：</span>
<span id="info"></span>
</div>
<div class="a c">
<p>base64编码：</p>
<textarea id="base64_code" rows="20" cols="60" class="a b"></textarea>
</div>
<div class="a c" style="width:445px;height:365px;">
<p>图片展示：</p>
<div id="img_area"></div>
</div>
<div class="d">
<input type="file" id="img_upload" />
</div>
</body>
</html>
<script type="text/javascript">
window.onload = function() {
var img_upload = document.getElementById("img_upload");
var base64_code = document.getElementById("base64_code");
var img_area = document.getElementById("img_area");
img_upload.addEventListener('change', readFile, false);
}
function readFile() {
var file = this.files[0];
if (!/image\/\w+/.test(file.type)) {
alert("请确保文件为图像类型");
return false;
}
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function(e) {
var data = e.target.result;
var image = new Image();
image.onload = function() {
var width = image.width;
var height = image.height;
var info = `width=${width},height=${height},size=${file.size}`;
document.getElementById("info").innerHTML = info;
}
image.src = data;
base64_code.innerHTML = this.result;
img_area.innerHTML = '<img src="' + this.result + '" alt=""/>';
}
}
</script>
