一:HTML标签
<button id="vv" onclick="myfunction()" >点击事件</button>
二:赋值函数变量
var funcc = function () {
alert('xxx')
}
var aa = document.getElementById('xx')
aa.onclick = funcc
document.getElementById('xx').onclick = function () {
alert('xxx')
}
addEventListener
document.getElementById('xx').addEventListener('click',funcc);
document.getElementById('xx').addEventListener('click',function () {
alert('xxx')
})
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