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# Javascript3

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• ### Javascript3

1. 1. 1.
2. 2. var a= b
3. 3. new
4. 4. var a = new String(“text”);
5. 5. var a = new String(“text”);• new• new String
6. 6. Stringnew
7. 7. new
8. 8. this
9. 9. function test(x,y){ this.x = x; this.y = y; } var a = new test(1,2);new test(1,2) testnewnew this
10. 10. this
11. 11. var a= obj; a obj
12. 12. this
13. 13. this=
14. 14. •• function(){ … }••
15. 15. var test = function(x,y){ this.x = x; this.y = y;};function test(x,y){ this.x = x; this.y = y;}
16. 16. var test = function(){ this.a = “abc”;};test.text = “ ”;test.text2 = “ ”;
17. 17. new
18. 18. new
19. 19. test
20. 20. var test = function(){ this.a = "abc";};test.text = " ";var a = new test();console.log(a.a);console.log(text.text);console.log(a.text);
21. 21. text
22. 22. thistext
23. 23. new
24. 24. prototype
25. 25. prototype
26. 26. prototype
27. 27. constructorprototype
28. 28. var test = function(){ this.a = "abc";};//test.prototypetest.prototype = { constructor:function(){ this.a= "abc" }, __proto__:Object //IE};
29. 29. __proto__ prototypeIE __proto__
30. 30. prototypenew prototype
31. 31. a.text = "1234" a text
32. 32. 2.
33. 33. var a = { abc:"text"};{}
34. 34. new
35. 35. prototypenew
36. 36. var test = { test : "text"};var Creator = function(){};Creator.prototype = test;var a = new Creator();console.log(a.test);//text