立即调用Javascript onclick函数（不单击时）？

你要

.onclick = secondFunction

不

.onclick = secondFunction()

后者调用（执行），

secondFunction

secondFunction

onclick

function start() {  var a = document.createElement("a");  a.setAttribute("href", "#");  a.onclick = secondFunction;  a.appendChild(document.createTextNode("click me"));  document.body.appendChild(a);}function secondFunction() {  window.alert("hello!");}start();

a.addEventListener("click", secondFunction);// ORa.addEventListener("click", function(event) {  secondFunction();  event.preventDefault();});