图

Graph类：

function Graph(v) {    
    this.vertices = v;   
    this.edges = 0;    
    this.adj = [];  
//初始化adj  
for (var i = 0; i < this.vertices; ++i) {       
    this.adj[i] = [];       
    this.adj[i].push("");    
}    
    this.addEdge = addEdge;    
    this.showGraph = showGraph; 
} 
 
 //插入边
 //邻接表
function addEdge(v, w) {    
    this.adj[v].push(w);    
    this.adj[w].push(v);
    this.edges++;  
  } 

 /*邻接矩阵存储......*/


//输出边
function showGraph() {    
for (var i = 0; i < this.vertices; ++i) { 
     putstr(i + " -> ");       
for (var j = 0; j < this.vertices; ++j ) {          
    if (this.adj[i][j] != undefined) {             
    putstr(this.adj[i][j] + '  ');          
    }       
}      
 print();    
    } 
}

/*
 vertices 节点数, Graph(v)传入的v是节点数
 edges 边数
 adj (邻接表数组,这里使用了法一,一个二维数组,每个节点的临界节点数组组成的数组)
*/

　　

以下测试程序演示了 Graph 类的用法：
load("Graph.js"); 

g = new Graph(5); 

g.addEdge(0,1); 

g.addEdge(0,2); 

g.addEdge(1,3); 

g.addEdge(2,4); 

g.showGraph();
程序的输出结果为：
0 -> 1 2 

1 -> 0 3 

2 -> 0 4 

3 -> 1 

4 -> 2

来自：《数据结构与算法JavaScript描述》