<!DOCTYPE html>
<html>
<head>
<title>HTML5上传图片预览</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="http://www.codefans.net/ajaxjs/jquery-1.6.2.min.js"></script>
</head>
<body>
<h3>请选择图片文件</h3>
<form name="form0" id="form0">
<input type="file" name="file0" id="file0" multiple="multiple" /><br><img src="" id="img0">
</form>
<script>
$("#file0").change(function() {
var objUrl = getObjectURL(this.files[0]);
console.log("objUrl = " + objUrl);
if(objUrl) {
$("#img0").attr("src", objUrl);
}
});
//建立一個可存取到該file的url
function getObjectURL(file) {
var url = null;
if(window.createObjectURL != undefined) { // basic
url = window.createObjectURL(file);
} else if(window.URL != undefined) { // mozilla(firefox)
url = window.URL.createObjectURL(file);
} else if(window.webkitURL != undefined) { // webkit or chrome
url = window.webkitURL.createObjectURL(file);
}
return url;
}
</script>
</body>
</html>
来源：https://www.cnblogs.com/horanly/p/6101221.html