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index.js
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index.js
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(function() {
var wrapper = document.getElementById('wrapper'),
preOrder = document.getElementById('pre-order'),
inOrder = document.getElementById('in-order'),
postOrder = document.getElementById('post-order');
var nodeArr = []; // 把子节点放在一个数组里
var animation = false; // 加一个状态锁,防止短时间内重复点击
// 中序遍历
var inOrderTraverseNode = function(node, callback) {
if (node !== null) {
inOrderTraverseNode(node.firstElementChild, callback); // 先访问左树
callback(node); // 再访问根节点
inOrderTraverseNode(node.lastElementChild, callback); // 最后访问右树
}
};
// 先序遍历
var preOrderTraverseNode = function(node, callback) {
if (node !== null) {
callback(node);
preOrderTraverseNode(node.firstElementChild, callback);
preOrderTraverseNode(node.lastElementChild, callback);
}
};
// 后序遍历
var postOrderTraverseNode = function(node, callback) {
if (node !== null) {
postOrderTraverseNode(node.firstElementChild, callback);
postOrderTraverseNode(node.lastElementChild, callback);
callback(node);
}
};
var pushNode = function (node) {
nodeArr.push(node);
}
var render = function() {
if (animation) {
alert('动画还没执行完。。。');
return false;
}
var i = 0;
animation = true;
nodeArr[i].style.backgroundColor = "blue";
var id = setInterval(function() {
i++;
if (i === nodeArr.length) {
clearInterval(id);
nodeArr[nodeArr.length - 1].style.backgroundColor = "#fff";
nodeArr = [];
animation = false;
return false;
}
nodeArr[i - 1].style.backgroundColor = "#fff";
nodeArr[i].style.backgroundColor = "blue";
}, 500);
}
preOrder.onclick = function() {
preOrderTraverseNode(wrapper, pushNode);
render();
};
inOrder.onclick = function() {
inOrderTraverseNode(wrapper, pushNode);
render();
};
postOrder.onclick = function() {
postOrderTraverseNode(wrapper, pushNode);
render();
};
})()