JavaScript WebAPI 文件 File.size 属性

javascriptfront end technologyobject oriented programming更新于 2025/11/24 0:44:17

JavaScript 文件 WebAPI file.size 属性返回文件的大小(以字节为单位)。

以下是文件 WebApi File.size 属性的代码 −

示例

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
   font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.result {
   font-size: 18px;
   font-weight: 500;
   color: red;
}
</style>
</head>
<body>
<h1>JavaScript file.size property</h1>
<div class="result"></div>
<input type="file" class="fileInput" />
<h3>
Upload a file using the above input type to get its file size
</h3>
<script>
let resultEle = document.querySelector(".result");
document
.querySelector(".fileInput")
.addEventListener("change", (event) => {
   resultEle.innerHTML += "File name = " + event.target.files[0].name + ‘<br>;
   resultEle.innerHTML += "File size = " + event.target.files[0].size + ' bytes ';
});
</script>
</body>
</html>