用户上传图片的时候，让图片即时地显示在页面上
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="file" name="file" onchange="showPreview(this)" />
<img id="portrait" src="" style="display:none;" />
</body>
<script type="text/javascript">
function showPreview(source) {
var file = source.files[0];
if(window.FileReader) {
var fr = new FileReader();
console.log(fr);
var portrait = document.getElementById('portrait');
fr.onloadend = function(e) {
portrait.src = e.target.result;
};
fr.readAsDataURL(file);
portrait.style.display = 'block';
}
}
</script>
</html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="file" name="file" onchange="showPreview(this)" />
<img id="portrait" src="" style="display:none;" />
</body>
<script type="text/javascript">
function showPreview(source) {
var file = source.files[0];
if(window.FileReader) {
var fr = new FileReader();
console.log(fr);
var portrait = document.getElementById('portrait');
fr.onloadend = function(e) {
portrait.src = e.target.result;
};
fr.readAsDataURL(file);
portrait.style.display = 'block';
}
}
</script>
</html>
