如何用javascript控制上传图片文件的大小
运行代码框<HTML> <HEAD> <TITLE> New Document </TITLE> <META NAME="Generator" CONTENT="EditPlus"> <META NAME="Author" CONTENT=""> <META NAME="Keywords" CONTENT=""> <META NAME="Description" CONTENT=""> </HEAD> <BODY> <input type="text" size="4" value="10" name="fileSizeLimit" id="fileSizeLimit"/> K <input type="file" name="file1" id="file1" size="40" onchange="changeSrc(this)"/> <img src="about:blank" id="fileChecker" alt="test" height="18"/> <script type="text/javascript"> var oFileChecker = document.getElementById("fileChecker"); function changeSrc(filePicker) { oFileChecker.src = filePicker.value; } oFileChecker.onreadystatechange = function () { if (oFileChecker.readyState == "complete") { checkSize(); } } function checkSize() { var limit = document.getElementById("fileSizeLimit").value * 1024; if (oFileChecker.fileSize > limit) { alert("too large"); } else { alert("ok"); } } </script> </BODY> </HTML> [Ctrl+A 全部选择 提示：你可先修改部分代码，再按运行]
