サイ本 文
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This document discusses JavaScript statements including variable declarations, functions, return, throw, try/catch, and with. It provides examples of how to declare variables, define functions, return values from functions, throw errors, handle errors with try/catch, and use the with statement to access properties within an object without specifying the object name. The document explains that finally blocks will execute after try/catch regardless of exceptions and return/break/continue in the try block.
![var
var name_1 [ = value_1 ] [ , ..., name_n [ = value_n ]]
→ Call
→](https://image.slidesharecdn.com/random-110302115000-phpapp02/85/-3-320.jpg)
![function
function funcname ([arg1 [, arg2 [..., argn]]]) {
statement
}](https://image.slidesharecdn.com/random-110302115000-phpapp02/85/-4-320.jpg)
![[takashi ~ 09:55 AM] $ node statement2.js
hogehogehogehoge //
node.js:63
throw e;
^
Error: //](https://image.slidesharecdn.com/random-110302115000-phpapp02/85/-16-320.jpg)
![[takashi ~ 10:01 AM] $ node statement2.js
hogehogehogehoge
node.js:63
throw e;
^
Error:](https://image.slidesharecdn.com/random-110302115000-phpapp02/85/-18-320.jpg)
![var foo = { bar : 1 };
var bar = 2;
console.log(bar);
with(foo){
console.log(bar);
delete foo['bar'];
console.log(bar);
}
[takashi ~ 10:10 AM] $ node dankogai1.js
2 // bar
1 // foo bar
2 // bar](https://image.slidesharecdn.com/random-110302115000-phpapp02/85/-21-320.jpg)
サイ本 文
- 1. 6
- 3. var var name_1 [ = value_1 ] [ , ..., name_n [ = value_n ]] → Call →
- 4. function function funcname ([arg1 [, arg2 [..., argn]]]) { statement }
- 5. • • •
- 6. function hoge() { huga(); function huga() { console.log("piyopiyo"); } } hoge(); // “piyopiyo”
- 10. Error function hoge() { try { throw "hogehogehgoe"; } catch(e) { console.log(e); } } hoge(); // “hogehogehoge”
- 11. 1. 2. catch 3.
- 12. try/catch/finaly ● ●
- 13. try { throw new Error(" "); // } catch(e) { // try console.log(e) // " " } finaly { // try // try // }
- 14. finally • • break , continue , return • catch •
- 15. function testfinally(a) { try { throw new Error(" "); } finally { console.log(a); } } testfinally("hogehogehogehoge");
- 16. [takashi ~ 09:55 AM] $ node statement2.js hogehogehogehoge // node.js:63 throw e; ^ Error: //
- 17. function testfinally(a) { try { throw new Error(" "); } catch(e) { throw new Error(" "); } finally { console.log(a); throw new Error(" "); } } testfinally("hogehogehogehoge");
- 18. [takashi ~ 10:01 AM] $ node statement2.js hogehogehogehoge node.js:63 throw e; ^ Error:
- 20. with by dankogai http://blog.livedoor.jp/dankogai/archives/51066288.html
- 21. var foo = { bar : 1 }; var bar = 2; console.log(bar); with(foo){ console.log(bar); delete foo['bar']; console.log(bar); } [takashi ~ 10:10 AM] $ node dankogai1.js 2 // bar 1 // foo bar 2 // bar
- 22. • with(object) object • object.name name ” with() without with() with(Math) with(new Namespace()) ”