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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>简单的html5 File测试 for pic2base64</title>
<style>
</style>
<script>
window.onload = function () {
var input = document.getElementById("fielinput");
var txshow = document.getElementById("txshow");
if (typeof (FileReader) === ‘undefined‘) {
result.innerHTML = "抱歉，你的浏览器不支持 FileReader，请使用现代浏览器操作！";
input.setAttribute(‘disabled‘, ‘disabled‘);
} else {
input.addEventListener(‘change‘, readFile, false);
txshow.onclick = function () { input.click(); }
}
}
function readFile() {
var file = this.files[0];
//判断是否是图片类型
if (!/image\/\w+/.test(file.type)) {
alert("只能选择图片");
return false;
}
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function (e) { txshow.src = this.result; alert(this.result); }
}
</script>
</head>
<body>
<input type="file" id="fielinput" >
<img id="txshow" style="width:100px;height:100px;"/>
</body>
</html>
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原文地址：http://www.cnblogs.com/tiancai/p/5619621.html
