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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>文件上传</title>
<style>
.upload-wrapper {
font-size: 0;
}
.file-input {
position: relative;
display: inline-block;
width: 200px;
height: 50px;
line-height: 50px;
border-radius: 5px;
text-align: center;
font-size: 18px;
font-weight: bold;
background-color: #009688;
color: #fff;
vertical-align: top;
z-index: 1;
}
#upload{
position: absolute;
left: 0;
top: 0;
width: 200px;
height: 50px;
opacity: 0;
}
#upload-img {
display: inline-block;
margin-left: 30px;
height: 200px;
}
.upload-pic {
height: 100%;
width: auto;
}
</style>
</head>
<body>
<div class="upload-wrapper">
<span class="file-input">上 传<input type="file" id="upload" /></span>
<div id="upload-img"></div>
</div>
<script>
var input = document.getElementById(‘upload‘);
if(typeof FileReader === undefined) {
input.setAttribute(‘disabled‘,‘disabled‘);
}else {
input.addEventListener(‘change‘,readFile,false);
}
function readFile(){
var file = this.files[0];
if(!/image\/\w+/.test(file.type)) {
alert("请选择图片！");
return false;
}
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function(e) {
var data = this.result.split(‘,‘);
var tp = (file.type == ‘image/png‘) ? ‘png‘ : ‘jpg‘;
var targetDiv = document.getElementById(‘upload-img‘);
var uploadPic = document.getElementsByClassName(‘upload-pic‘);
if(uploadPic.length === 0) {
var img = document.createElement(‘img‘);
img.src = data[0]+‘,‘+data[1];
img.className = ‘upload-pic‘;
targetDiv.appendChild(img);
}
else {
uploadPic[0].src = data[0]+‘,‘+data[1];
}
//之后的处理将图片数据上传到服务器
}
}
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/rellame/p/5569998.html
