<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片上传</title>
</head>
<body>
<!-- 要将父布局的position设置为relative，父布局将无法包裹input -->
<div style="position: relative;">
<!--设置input的position为absolute，使其不按文档流排版，并设置其包裹整个布局 -->
<!-- 设置opactity为0，使input变透明 -->
<!-- 只接受jpg，gif和png格式 -->
<input id="upload-input" style="position: absolute; top: 0; bottom: 0; left: 0;right: 0; opacity: 0;" type="file" accept="image/gif, image/jpg, image/png" onchange="showImg(this)" multiple />
<!-- 自定义按钮效果 -->
<div style="text-align: top">
<span style="font-size: 12px;">上传文件：</span>
<img id="upload" src="./upload.png" style=" 40px; height: 40px; vertical-align: middle;" />
</div>
</div>
<div id="imgContainer" style="margin-top: 10px;"></div>
</body>
<script type="text/javascript">
function showImg(obj) {
var files = obj.files
// document.getElementById("imgContainer").innerHTML = getImgsByUrl(files)
getImgsByFileReader(document.getElementById("imgContainer"), files)
}
// 使用window.URL.createObjectURL(file)读取file实例并显示图片
function getImgsByUrl(files) {
var elements = ''
for (var i = 0; i < files.length; i++) {
var url = window.URL.createObjectURL(files[i])
elements += "<img src='"+ url + "' style=' 40px; height: 40px; vertical-align: middle; margin-right: 5px;' />"
}
return elements
}
// 使用FileReader读取file实例并显示图片
function getImgsByFileReader(el, files) {
for (var i = 0; i < files.length; i++) {
let img = document.createElement('img')
img.setAttribute('style', ' 40px; height: 40px; vertical-align: middle; margin-right: 5px;')
el.appendChild(img)
var reader = new FileReader()
reader.onload = function(e) {
img.src = e.target.result
}
reader.readAsDataURL(files[i])
}
}
</script>
</html>