js 上传图片本地预览缓存
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件上传</title>
<script src="jQuery.js"></script>
<style type="text/css">
#file{
display: block;
width: 400px;
height: 300px;
opacity:0;
margin: -300px 0 0 0;
}
#preview{
display: block;
width: 400px;
height: 300px;
}
</style>
</head>
<body>
<img id="preview" src="" alt="点击上传图片"/>
<input type="file" id="file" />
</body>
</html>
<script type="text/javascript">
$('#file').on('change', function(){
//获取文件列表对象
var fileList = $('#file')[0].files;
//创建文件流获取文件地址
var src = URL.createObjectURL(fileList[0]);
//设置图片路径
$("#preview").attr("src", src);
});
</script>
