Question

我正在学习javascript，现在开始使用对象和基本功能。我遇到了这种类型的代码，并想知道这究竟是什么

var stringFunction = function(){};

stringFunction.test1 = function(){
  console.log("Test 1");
}

test1是stringFunction的一部分还是命名约定。提前谢谢

Answer 1

//pdf generated not given avobe code of how it comes $pdfdoc = $pdf->Output("confirmation-".$client_code.".pdf", "S"); $attachment = chunk_split(base64_encode($pdfdoc)); $to = $mail_to; $from = "From: <info@ksilbd.com>"; $subject = "Here is your attachment"; $mainMessage = "BUY/SALE CONFIRMATION"; $fileatt = $attachment; $fileatttype = "application/pdf"; $fileattname = "confirmation-".$client_code.".pdf"; $headers = "From: $from"; $file = fopen($fileatt, 'rb'); $data = fread($file, filesize($fileatt)); fclose($file); $semi_rand = md5(time()); $mime_boundary = "==Multipart_Boundary_x{$semi_rand}x"; $headers .= "\nMIME-Version: 1.0\n" . "Content-Type: multipart/mixed;\n" . " boundary=\"{$mime_boundary}\""; $message = "This is a multi-part message in MIME format.\n\n" . "-{$mime_boundary}\n" . "Content-Type: text/plain; charset=\"iso-8859-1\n" . "Content-Transfer-Encoding: 7bit\n\n" . $mainMessage . "\n\n"; //base_64 //encoding used //to encode data $data = chunk_split(base64_encode($data)); //message //concat the //message $message .= "--{$mime_boundary}\n" . "Content-Type: {$fileatttype};\n" . " name=\"{$fileattname}\"\n" . "Content-Disposition: attachment;\n" . " filename=\"{$fileattname}\"\n" . "Content-Transfer-Encoding: base64\n\n" . $data . "\n\n" . "-{$mime_boundary}-\n"; // Send the email if(mail($to, $subject, $message, $headers)) { echo "EMAIL SENT SUCCESSFUL."; } else { echo "There was an error sending the mail.";个实例在Javascript中有点“怪异”，因为它们是对象，但function为typeof而不是"function"。

但是，他们可以使用语法"object"或f.x添加和访问属性。您的代码只是向f["x"]对象添加一个属性（属性的值也是一个函数，但这是无关紧要的。）

Answer 2

此处test1()是stringFunction var的属性（函数类型）所以你在函数对象中定义了一个函数。

您可以通过调用stringFunction.test1();来使用它，因为您可以调用外部函数：stringFunction();

var stringFunction = function(){console.log("Test stringFunction")};

stringFunction.test1 = function(){
    console.log("Test 1");
}

stringFunction();
stringFunction.test1();

输出：

测试stringFunction

测试1

Answer 3

在JavaScript中

每个函数都是一个Function Object。见https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function。在您的示例中，代码在对象stringFunction上创建属性“test1”。新属性是itsealf一个函数对象。

这是命名约定还是函数声明

3 个答案: