<button type="button" id="btn">按钮点击</button>
<script type="text/javascript">var btn = document.getElementById("btn");
var flag = true;
btn.addEventListener("click",
function() {
if (flag) {
console.log("do sth……");
flag = false;
setTimeout(function() {
flag = true;
},3000)
} else {
console.log("请勿重复点击")
}
})
</script>