我尝试了下面的代码,但是当我单击按钮时没有显示警报消息!
let clickButton = document.getElementsByClassName("buttonClass");
clickButton.onclick = clickFunc;
function clickFunc(){ alert("hello")};
console.log(clickButton);
i create buttons with document.createElement
我试过了:
只选择一个这样的按钮let clickButton = document.getElementsByClassName("buttonClass")[1];
但什么都不选择
我也尝试通过标记名获取元素,使用一定长度的按钮进行循环,并添加事件侦听器,但什么也没有
答案 0 :(得分:0)
let buttons = document.getElementsByClassName("buttonClass");
for (var i = 0; i < buttons.length; i++) {
buttons.item(i).addEventListener('click', function(e) {
alert("hello");
});
}
<button type="button" class="buttonClass">button 1</button>
<button type="button" class="buttonClass">button 2</button>
<button type="button" class="buttonClass">button 3</button>
<button type="button" class="buttonClass">button 4</button>
<button type="button" class="buttonClass">button 5</button>
由于您按类别定位,因此您将获得一组元素。所以你必须迭代并将点击事件附加到每个元素,如下所示;
let buttons = document.getElementsByClassName("buttonClass");
for (var i = 0; i < buttons.length; i++) {
buttons.item(i).addEventListener('click', function(e) {
alert("hello");
});
}