ExtJS Basic--function The method that can be executed at the time of definition Function () {...} ()

The function () of the method that can be executed when the function is defined in Ext.js () {...} () JS Code

2. /**
4. * Part Two function: The function of the method that can be executed at the time of definition () {...} (); Note that after the red parenthesis , the function definition, the price brackets are defined and then executed
6. */
8. /**
10. * I. Definition and execution of common methods
12. */
14. 1-1, normal method definition, without the return value of the case
16. Fun = function () {
18. Alert ("execute");
20. };
22. 1-2, normal method execution, without the return value of the case
24. Fun ();//output Result: Execute
28. 2-1, normal method definition, with return value, and the return value is a string case
30. Fun = function () {
32. Alert ("execute");
34. Return "is the string returned";
36. }
38. 2-2, normal method execution, with the return value, and the return value is a string case
40. Fun ();//output Result: Execute
42. 2-3, the normal method executes, with the return value, and the return value is a string case, and the return value output
44. Alert (fun ());//output: Execute, return the string, (two warning boxes appear), because the fun () is executed first, and then bring back the returned string, and then through the alert output
46. Alert (typeof fun ());//Output Result: Execute, string
50. 3-1, normal method definition, with return value, and the return value is an object case
52. Fun = function () {
54. Alert ("execute");
56. return new Date ();
58. }
60. 3-2, normal method execution, with the return value, and the return value is an object case
62. Fun ();//output Result: Execute
64. 3-3, the normal method executes, with the return value, and the return value is an object case, and the return value output
66. Alert (fun ());//Output Result: Execute, Wed may 16:25:32 utc+0800 2008
68. 3-4, the normal method executes, with the return value, and the return value is an object case, and the return value type output
70. Alert (typeof fun ());//Output Result: Execute, Object
74. 4-1, normal method execution, with the return value, and the return value is a function of the case
76. Fun = function () {
78. Alert ("execute");
80. return function () {
82. Alert ("return type is a method");
84. };
86. }
88. 4-2, normal method execution, with the return value, and the return value is a function of the case
90. Fun ();//output Result: Execute
92. 4-3, because Fun () is returned after execution of a function, so according to the function of the returned parameter conditions (such as the number and type of parameters) to perform a return function,
94. Because the returned function here does not require parameters, it can be executed directly with ().
96. Fun () ();//Output result: execution, return type is a method
98. 3-4, the normal method executes, with the return value, and the return value is an object case, and the return value type output
100. Alert (typeof fun ());//Output Result: Execute, function
104. /**
106. * Can be executed when defined
108. */
112. Fun = function () {
114. Alert ("execute");
116. }();
118. alert (fun);
122. Fun = function () {
124. Alert ("execute");
126. Return "is the string returned"; A string is returned.
128. }();
130. Alert (Fun)
136. Fun = function () {
138. Alert ("execute");
140. return new Date (); It returns an object.
142. }();
144. alert (fun);
150. Fun = function () {
152. Alert ("execute");
154. return function () {
156. Alert ("return type is a method");
158. }//Returned is a method
160. }();
162. Fun ();

Original link: http://yahaitt.iteye.com/blog/193054

ExtJS Basic--function The method that can be executed at the time of definition Function () {...} ()