<!DOCTYPE html>
<html>
<head>
<title></title>
</head>
<body>
<input type="button" value="添加">
<ul></ul>
<script>
var oUl = document.querySelector("ul");
var oBtn = document.querySelector("input");
var count = 0;
var timer = null;
function createDom() {
var oLi = document.createElement("li");
oLi.innerHTML = count++;
oUl.appendChild(oLi);
}
var addDom = (function () {
return new Promise(function (resolve, reject) {
resolve(createDom);
});
})();
oBtn.onclick = function () {
timer = setInterval(function () {
if (count == 10) {
clearInterval(timer);
} else {
addDom.then(function (fn) {
fn();
});
}
}, 1000);
}
</script>
</body>
</html>
promise 的基本用法