fall-through | 易学教程

Autohotkey hotkey handlers fall through/continue to lines below

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问题 I’m having some trouble with Autohotkey. I have a script with a few hotkeys but it seems that when a hotkey is pressed, not only does its handler run, but so do all lines below it, including the contents of other hotkey handlers. Below is a demonstrative example. What is the problem? How can I get Autohotkey to execute only the lines specified in the handler? #SingleInstance force ;Main loop While 1 { } ;Hotkeys: ;Quit with Ctrl+Q ^q:: { MsgBox Quitting ExitApp } ^s:: { MsgBox Hotkey1 }

Internet explorer 8 event fall through transparent parents

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问题 When you have a transparent div and you generate a click on in (for example) the click falls right through to elemets below. This behavior does not exists in other modern browsers and I am sure is out of any W3C recommendation. Finally, it messes up my design. Is there any way to work around this? Clarification - transparent like with no background color defined or with background-color: transparent; Another clarification - what I mean by falls right through is that the browser behaves as the

Switch fallthrough in Dart

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问题 I started learning Dart today, and I've come across something that my google skills are having trouble finding. How do I have a fall-through in a non-empty case? My use case is this: I'm writing a sprintf implementation (since dart doesn't have this too), which would work except for this fall-through thing. When parsing the variable type you can, for example, have "%x" versus "%X" where the upper case type tells the formatter that the output is supposed to be uppercase. The semi-pseudocode

Falling through switch statement (works sometimes?)

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问题 I have a switch statement such as the one below: switch (condition) { case 0: case 1: // Do Something break; case 2: // Do Something case 3: // Do Something break; } I get a compile error telling me that Control cannot fall through from one case label ('case 2:') to another Well... Yes you can. Because you are doing it from case 0: through to case 1: . And in fact if I remove my case 2: and it's associated task, the code compiles and will fall through from case 0: into case1: . So what is

Idiomatic match with fall-through in Rust

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I’m new to Rust, but as a fan of Haskell, I greatly appreciate the way match works in Rust. Now I’m faced with the rare case where I do need fall-through – in the sense that I would like all matching cases of several overlapping ones to be executed. This works: fn options(stairs: i32) -> i32 { if stairs == 0 { return 1; } let mut count: i32 = 0; if stairs >= 1 { count += options(stairs - 1); } if stairs >= 2 { count += options(stairs - 2); } if stairs >= 3 { count += options(stairs - 3); } count } My question is whether this is idiomatic in Rust or whether there is a better way. Edit: The

Idiomatic implementation of the tribonacci sequence in Rust

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问题 I’m new to Rust, but as a fan of Haskell, I greatly appreciate the way match works in Rust. Now I’m faced with the rare case where I do need fall-through – in the sense that I would like all matching cases of several overlapping ones to be executed. This works: fn options(stairs: i32) -> i32 { if stairs == 0 { return 1; } let mut count: i32 = 0; if stairs >= 1 { count += options(stairs - 1); } if stairs >= 2 { count += options(stairs - 2); } if stairs >= 3 { count += options(stairs - 3); }

Test for multiple cases in a switch, like an OR (||)

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How would you use a switch case when you need to test for a or b in the same case? switch (pageid) { case "listing-page" || "home-page": alert("hello"); break; case "details-page": alert("goodbye"); break; } kei You can use fall-through: switch (pageid) { case "listing-page": case "home-page": alert("hello"); break; case "details-page": alert("goodbye"); break; } Since the other answers explained how to do it without actually explaining why it works: When the switch executes, it finds the first matching case statement and then executes each line of code after the switch until it hits either a

Test for multiple cases in a switch, like an OR (||)

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问题 How would you use a switch case when you need to test for a or b in the same case? switch (pageid) { case \"listing-page\" || \"home-page\": alert(\"hello\"); break; case \"details-page\": alert(\"goodbye\"); break; } 回答1: You can use fall-through: switch (pageid) { case "listing-page": case "home-page": alert("hello"); break; case "details-page": alert("goodbye"); break; } 回答2: Since the other answers explained how to do it without actually explaining why it works: When the switch executes,