「数据结构」树的遍历

javascript
function dfs(root){
    //do sth
    dfs(root.left);
    dfs(root.right);
}

javascript
function dfs(root){
    dfs(root.left);
    //do sth
    dfs(root.right);
}

javascript
 function dfs(root){
    dfs(root.left);
    dfs(root.right);
    //do sth
}