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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title></title>
<style type="text/css">
html{font-family: "microsoft yahei";overflow: hidden;}
html{height: 100%;padding: 0;margin: 0;}
a{text-decoration: none;outline: none;}
.title{color: #ddd;text-shadow: 2px 2px 5px #000;padding: 80px 0px 0px 100px;}
.main,.img_main{float: left;background-color: rgba(255,255,255,.7);border-radius: 4px;padding: 20px;margin: 0 3px;}
.main{width: 40%;margin-left:100px;}
.img_main{max-width: 40%;}
.preview{width: 100%;}
.select-file{border:1px solid #9B59B6;position: relative;}
.select-file:after{content: ‘‘;display: block;clear: both;}
.select-file-title,.select-file-btn{float: left;line-height: 30px;height: 30px;}
.select-file-title{width: 80%;}
.select-file-btn{width: 20%;background-color: #8E44AD;text-align: center;color: #fff;transition: background-color .5s;}
.select-file-btn:hover{background-color: #1ABC9C;}
.base64-text{background-color:transparent;height: 300px;width: calc(100% - 6px);resize:none;overflow: auto;border: 1px solid #9B59B6;margin-top: 10px;word-break: break-all;}
</style>
</head>
<body>
<h1 class="title">图片转Base64</h1>
<div class="main">
<div class="control">
<div class="select-file">
<div class="select-file-title"></div>
<a href="javascript:;" class="select-file-btn">选择文件</a>
</div>
</div>
<div class="control">
<textarea class="base64-text" readonly></textarea>
</div>
</div>
<div class="img_main">
<img src="" class="preview"/>
</div>
<script type="text/javascript">
var inputFile = document.createElement(‘input‘);
inputFile.type = ‘file‘;
inputFile.accept = ‘image/*‘;
var selectFile = document.querySelector(‘.select-file‘);
var base64Text = document.querySelector(‘.base64-text‘);
var preview = document.querySelector(‘.preview‘);
var reader = new FileReader();
reader.onload = function(){
base64Text.innerText = this.result;
preview.src = this.result;
};
inputFile.addEventListener(‘change‘, function(){
selectFile.querySelector(‘.select-file-title‘).innerHTML = this.value;
if(this.files.length == 0){
base64Text.innerText = ‘‘;
return;
}
var file = inputFile.files[0];
base64Text.placeholder = ‘‘;
if(!(/^image/.test(file.type))){
base64Text.placeholder = ‘不是图片文件‘;
return;
}
reader.readAsDataURL(file);
});
selectFile.addEventListener(‘click‘, function(){
inputFile.click();
});
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/neuscx/p/5067746.html
