16.图的深度搜索和广度搜索代码实现（JavaScript版）
图的深度搜索和广度搜索
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<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
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<body>
<script>
function Node(value){
this.value = value;
this.neighbor = [];
}
var nodeA = new Node("a");
var nodeB = new Node("b");
var nodeC = new Node("c");
var nodeD = new Node("d");
var nodeE = new Node("e");
var nodeF = new Node("f");
var nodeG = new Node("g");
var nodeH = new Node("h");
nodeA.neighbor.push(nodeB);
nodeA.neighbor.push(nodeC);
nodeB.neighbor.push(nodeA);
nodeB.neighbor.push(nodeD);
nodeB.neighbor.push(nodeF);
nodeC.neighbor.push(nodeA);
nodeC.neighbor.push(nodeD);
nodeC.neighbor.push(nodeG);
nodeD.neighbor.push(nodeB);
nodeD.neighbor.push(nodeC);
nodeD.neighbor.push(nodeE);
nodeE.neighbor.push(nodeD);
nodeE.neighbor.push(nodeF);
nodeE.neighbor.push(nodeG);
nodeF.neighbor.push(nodeB);
nodeF.neighbor.push(nodeE);
nodeF.neighbor.push(nodeH);
nodeG.neighbor.push(nodeC);
nodeG.neighbor.push(nodeE);
nodeG.neighbor.push(nodeH);
nodeH.neighbor.push(nodeF);
nodeH.neighbor.push(nodeG);
//图的深度优先搜索
function deepSearch(node, target, path){
if(node == null) return false;
if(path.indexOf(node) > -1) return false;//若该节点已经搜索过，返回
if(node.value == target) return true;
path.push(node);//将该节点添加到已经遍历的节点中
var result = false;//默认没有目标节点
for(var i = 0; i < node.neighbor.length; i++){
result |= deepSearch(node.neighbor[i], target, path);//在所有分支上寻找目标节点
}
return result ? true : false;
}
console.log(deepSearch(nodeB, "i", []));
//图的广度优先搜索
function breadthSearch(nodes, target, path){
if(nodes == null || nodes.length == 0) return false;
var neighbor = [];
for(var i = 0; i < nodes.length; i++){//循环所有下一层节点
if(path.indexOf(nodes[i]) > -1) continue;//该节点已遍历，返回
if(nodes[i].value == target) return true;//找到了目标节点
path.push(nodes[i]);//将该节点放入已遍历节点中
neighbor = neighbor.concat(nodes[i].neighbor);//将该节点的邻居节点放入数组中
}
return breadthSearch(neighbor, target, path);//搜索下一层节点
}
console.log(breadthSearch([nodeA], "i", []));
</script>
</body>
</html>
