ถามเรื่องเกล็ดหิมะหน้าเว็ป

HuaHin

ผมไปเจอโค้ดจาวามา

1. //Snow - http://www.btinternet.com/~kurt.grigg/javascript
   
2. 
   
3. if  ((document.getElementById) &&
   
4. window.addEventListener || window.attachEvent){
   
5. 
   
6. (function(){
   
7. 
   
8. //Configure here.
   
9. 
   
10. var num = 30;   //Number of flakes
    
11. var timer = 30; //setTimeout speed. Varies on different comps
    
12. var enableinNS6 = 1 //Enable script in NS6/Mozilla? Snow animation could be slow in those browsers. (1=yes, 0=no).
    
13. 
    
14. //End.
    
15. 
    
16. var y = [];
    
17. var x = [];
    
18. var fall = [];
    
19. var theFlakes = [];
    
20. var sfs = [];
    
21. var step = [];
    
22. var currStep = [];
    
23. var h,w,r;
    
24. var d = document;
    
25. var pix = "px";
    
26. var domWw = (typeof window.innerWidth == "number");
    
27. var domSy = (typeof window.pageYOffset == "number");
    
28. var idx = d.getElementsByTagName('div').length;
    
29. 
    
30. if (d.documentElement.style &&
    
31. typeof d.documentElement.style.MozOpacity == "string")
    
32. num = 12;
    
33. 
    
34. for (i = 0; i < num; i++){
    
35. sfs[i] = Math.round(1 + Math.random() * 1);
    
36. 
    
37. document.write('<div id="flake'+(idx+i)+'" style="position:absolute;top:0px;left:0px;width:'
    
38. +sfs[i]+'px;height:'+sfs[i]+'px;background-color:#ffffff;font-size:'+sfs[i]+'px"><\/div>');
    
39. 
    
40. currStep[i] = 0;
    
41. fall[i] = (sfs[i] == 1)?
    
42. Math.round(2 + Math.random() * 2): Math.round(3 + Math.random() * 2);
    
43. step[i] = (sfs[i] == 1)?
    
44. 0.05 + Math.random() * 0.1 : 0.05 + Math.random() * 0.05 ;
    
45. }
    
46. 
    
47. 
    
48. if (domWw) r = window;
    
49. else{
    
50.   if (d.documentElement &&
    
51.   typeof d.documentElement.clientWidth == "number" &&
    
52.   d.documentElement.clientWidth != 0)
    
53.   r = d.documentElement;
    
54. else{
    
55.   if (d.body &&
    
56.   typeof d.body.clientWidth == "number")
    
57.   r = d.body;
    
58. }
    
59. }
    
60. 
    
61. 
    
62. function winsize(){
    
63. var oh,sy,ow,sx,rh,rw;
    
64. if (domWw){
    
65.   if (d.documentElement && d.defaultView &&
    
66.   typeof d.defaultView.scrollMaxY == "number"){
    
67.   oh = d.documentElement.offsetHeight;
    
68.   sy = d.defaultView.scrollMaxY;
    
69.   ow = d.documentElement.offsetWidth;
    
70.   sx = d.defaultView.scrollMaxX;
    
71.   rh = oh-sy;
    
72.   rw = ow-sx;
    
73. }
    
74. else{
    
75.   rh = r.innerHeight;
    
76.   rw = r.innerWidth;
    
77. }
    
78. h = rh - 2;  
    
79. w = rw - 2;
    
80. }
    
81. else{
    
82. h = r.clientHeight - 2;
    
83. w = r.clientWidth - 2;
    
84. }
    
85. }
    
86. 
    
87. 
    
88. function scrl(yx){
    
89. var y,x;
    
90. if (domSy){
    
91. y = r.pageYOffset;
    
92. x = r.pageXOffset;
    
93. }
    
94. else{
    
95. y = r.scrollTop;
    
96. x = r.scrollLeft;
    
97. }
    
98. return (yx == 0)?y:x;
    
99. }
    
100. 
     
101. 
     
102. function snow(){
     
103. var dy,dx;
     
104. 
     
105. for (i = 0; i < num; i++){
     
106. dy = fall[i];
     
107. dx = fall[i] * Math.cos(currStep[i]);
     
108. 
     
109. y[i]+=dy;
     
110. x[i]+=dx;
     
111. 
     
112. if (x[i] >= w || y[i] >= h){
     
113.   y[i] = -10;
     
114.   x[i] = Math.round(Math.random() * w);
     
115.   fall[i] = (sfs[i] == 1)?
     
116.   Math.round(2 + Math.random() * 2): Math.round(3 + Math.random() * 2);
     
117.   step[i] = (sfs[i] == 1)?
     
118.   0.05 + Math.random() * 0.1 : 0.05 + Math.random() * 0.05 ;
     
119. }
     
120. 
     
121. theFlakes[i].top = y[i] + scrl(0) + pix;
     
122. theFlakes[i].left = x[i] + scrl(1) + pix;
     
123. 
     
124. currStep[i]+=step[i];
     
125. }
     
126. setTimeout(snow,timer);
     
127. }
     
128. 
     
129. 
     
130. function init(){
     
131. winsize();
     
132. for (i = 0; i < num; i++){
     
133. theFlakes[i] = document.getElementById("flake"+(idx+i)).style;
     
134. y[i] = Math.round(Math.random()*h);
     
135. x[i] = Math.round(Math.random()*w);
     
136. }
     
137. snow();
     
138. }
     
139. 
     
140. 
     
141. if (window.addEventListener){
     
142. window.addEventListener("resize",winsize,false);
     
143. window.addEventListener("load",init,false);
     
144. }  
     
145. else if (window.attachEvent){
     
146. window.attachEvent("onresize",winsize);
     
147. window.attachEvent("onload",init);
     
148. }
     
149. 
     
150. })();
     
151. }//End.

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Nuknan

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HuaHin

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