当收件箱按钮被点击它运行inbox_open（）函数和在收件箱中头3个按钮出现，但onclick事件侦听器是丢失。// inbox.open评论后检查代码，关键行：b.onclick = function() { console.log("button was clicked"); }和inbox.setAttribute("title", poH.innerHTML);
// inbox
var inbox = document.getElementById("inbox");
var inbox_news = document.getElementById("inbox_news");
var poH = document.createElement("span");
var poC = document.createElement("span");
var new_from_to = [0, 2, 3];
var number_of_news = [2, 1, 2];
var news_price_data = [10, 20, 30, 40, 50];
// inbox.open
function inbox_open() {
for (var i = 0; i < number_of_news.length; i++) {
var b = document.createElement("button");
b.innerHTML = (i + …