specifications

Automatic semicolon insertion & return statements [duplicate]

由 此生再无相见时 提交于 2019-11-26 03:44:23
问题 This question already has answers here : What are the rules for JavaScript's automatic semicolon insertion (ASI)? (5 answers) Closed 4 years ago . As you might know, ECMAscript tries to be smart and will automatically insert semicolons if you didn\'t write those explicitly. Simple example function foo() { var bar = 5 return bar } will still work as expected. But there are some caveats if you rely on that. If we re-write that function like so function foo() { var bar = 5 return { bar: bar } }

Do the JSON keys have to be surrounded by quotes?

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-11-26 01:27:34
问题 Example: Is the following code valid against the JSON Spec? { precision: \"zip\" } Or should I always use the following syntax? (And if so, why?) { \"precision\": \"zip\" } I haven\'t really found something about this in the JSON specifications. Although they use quotes around their keys in their examples. 回答1: Yes, you need quotation marks. This is to make it simpler and to avoid having to have another escape method for javascript reserved keywords, ie {for:"foo"} . 回答2: You are correct to

Regarding Promises/A+ Specification, what is the difference between the terms “thenable” and “promise”?

由 ≯℡__Kan透↙ 提交于 2019-11-26 01:01:04
问题 I am checking out the \"Promises/A+\" Specification, but could not understand the following things: On Section 1. Terminology, 1.1. \"promise” is an object or function with a then method whose behavior conforms to this specification. 1.2. “thenable” is an object or function that defines a then method. So What is the difference between the terms \"thenable\" and \"promise\" ? Also in Section 2.3. The Promise Resolution Procedure, The promise resolution procedure is an abstract operation taking

How to encode the filename parameter of Content-Disposition header in HTTP?

由 心不动则不痛 提交于 2019-11-25 23:57:03
问题 Web applications that want to force a resource to be downloaded rather than directly rendered in a Web browser issue a Content-Disposition header in the HTTP response of the form: Content-Disposition: attachment; filename= FILENAME The filename parameter can be used to suggest a name for the file into which the resource is downloaded by the browser. RFC 2183 (Content-Disposition), however, states in section 2.3 (The Filename Parameter) that the file name can only use US-ASCII characters:

Regarding Promises/A+ Specification, what is the difference between the terms “thenable” and “promise”?

由 我只是一个虾纸丫 提交于 2019-11-25 22:43:44
I am checking out the "Promises/A+" Specification, but could not understand the following things: On Section 1. Terminology, 1.1. "promise” is an object or function with a then method whose behavior conforms to this specification. 1.2. “thenable” is an object or function that defines a then method. So What is the difference between the terms "thenable" and "promise" ? Also in Section 2.3. The Promise Resolution Procedure, The promise resolution procedure is an abstract operation taking as input a promise and a value, which we denote as [[Resolve]](promise, x) . So my question is: Why is it

What's the use/meaning of the @ character in variable names in C#?

由 99封情书 提交于 2019-11-25 21:58:50
问题 I discovered that you can start your variable name with a \'@\' character in C#. In my C# project I was using a web service (I added a web reference to my project) that was written in Java. One of the interface objects defined in the WSDL had a member variable with the name \"params\". Obviously this is a reserved word in C# so you can\'t have a class with a member variable with the name \"params\". The proxy object that was generated contained a property that looked like this: public
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