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获取本地图片可以使用FileReader对象中的readAsDataURL方法

实例

<!DOCTYPE html>
<html lang="en">
<head><meta charset="UTF-8"><title>JQuery 获取本地图片的方法</title><script type="text/javascript" src="../js/jquery-3.3.1.js"></script>
</head>
<body><input class="input-file" type="file"><div><img src="" class="photo"/></div>
<script>$(function(){$(".input-file").change(function(e) {//得到事件的目标节点,既input元素var imgBox = e.target;getImg(imgBox);$(".input-file").change = null;});function getImg(tag) {//第一张input选择的图片的一些参数var file = tag.files[0];var reader = new FileReader();//将文件以Data URL形式读入页面reader.readAsDataURL(file);reader.onload = function() {//result结果为 DataURLvar imgSrc = this.result;//将图片显示出来$(".photo").attr("src", imgSrc);}}})
</script>
</body>
</html>

readAsDataURL方法会使用base-64进行编码,编码的资料由data字串开始,后面跟随的是MIME type,然后再加上base64字串,逗号之后就是编码过的图像文件的内容。

"data:image/png;base64,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…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"

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