第二章 函数简介
1 第一个函数示例
1 <script language="JavaScript" type="text/JavaScript">
2
3 function bark(name,weight)
4
5 {
6
7 if(weight>20)
8
9 console.log(name+" says WOOF WOOF");
10
11 else
12
13 console.log(name+" says woof woof");
14
15 }
16
17 bark("rover",23);
18
19 bark("spot",18);
20
21 </script>
2 函数参数错误处理
传入参数不够，将没有相应参数实参的形参设置成未定义
如果传递的参数太多，js将忽略多余的参数
如果无return返回undefined
第三章 数组
1 第一个示例
1 var score=[];
2
3 var myarray=new Array(3);
4
5 myarray[1]="asdf";
6
7 scores=[60,50,60,58,54,52];
8
9 var solution2=scores[2];
10
11 var Length=scores.length;
12
13 alert("There are "+Length+"solutions and Solution 2 produced "+solution2+" bubbles."+"and "+myarray[1]+"!");
2 第二个示例：
1 <!doctype html>
2
3 <html lang="en">
4
5 <head>
6
7 <title>Battleship</title>
8
9 <meta charset="utf-8">
10
11 </head>
12
13 <body>
14
15 <script language="JavaScript" type="text/JavaScript">
16
17 var scores=[60,50,60,58,54,54,
18
19 58,50,52,54,48,69,
20
21 34,55,51,52,44,51,
22
23 69,64,66,55,52,61,
24
25 46,31,57,52,44,18,
26
27 41,53,55,61,51,44];
28
29 var highscore=printAndGetHighScore(scores);
30
31 console.log("Bubbles test: "+scores.length);
32
33 console.log(" Hightest Bubble score: "+highscore);
34
35 var bestSolutions=[];
36
37 bestSolutions=getBestResults(scores,highscore);
38
39 console.log("Solution with the hightest score: "+bestSolutions);
40
41 function printAndGetHighScore(scores)
42
43 {
44
45 var highscore=0;
46
47 var output;
48
49 for(var i=0;i<scores.length;i++)
50
51 {
52
53 output="Bubble solutoin #"+i+" score: "+scores[i];
54
55 console.log(output);
56
57 if(scores[i]>highscore)
58
59 highscore=scores[i];
60
61 }
62
63 return highscore;
64
65 }
66
67 function getBestResults(scores,highscore)
68
69 {
70
71 var bestSolutions=[];
72
73 //var j=0;
74
75 for(var i=0;i<scores.length;i++)
76
77 {
78
79 if(scores[i]==highscore)
80
81 {
82
83 //bestSolutions[j]=i;
84
85 //j++;
86
87 bestSolutions.push(i);
88
89 }
90
91 }
92
93 return bestSolutions;
94
95 }
96
97 </script>
98
99 </body>
100
101 </html>