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3.html
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3.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script>
window.onload= function () {
/*
var aBtn = document.getElementsByTagName('input')
for (var i=0; i < aBtn.length; i++) {
aBtn[i].onclick = function () {
alert(i)
}
}*/
var aBtn = document.getElementsByTagName('input')
for (let i = 0; i < aBtn.length; i++) {
aBtn[i].onclick = function () {
alert(i)
}
}
/*
var aBtn = document.getElementsByTagName('input')
for (var i = 0; i < aBtn.length; i++) {
// 封装到函数里，限制作用域
(function (i) {
aBtn[i].onclick = function () {
alert(i)
}
})(i)
}*/
}
</script>
</head>
<body>
<input type="button" value="按钮1">
<input type="button" value="按钮2">
<input type="button" value="按钮3">
</body>
</html>