js for循环取值，alert(i)始终是3，怎么才能让button分别显示1,2,3，function(){}怎么才能取到对应的i值
<!DOCTYPEhtml><html><head><metacharset="utf-8"><title>abc</title></head><body><inputc...
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>abc</title>
</head>
<body>
<input class="btn" type="button" />
<input class="btn" type="button" />
<input class="btn" type="button" />
<script>
for(var i=0;i<3;i++){
document.getElementsByClassName("btn").item(i).onmousedown=function(){
alert(i);
};
}
</script>
</body>
</html> 展开
<html>
<head>
<meta charset="utf-8">
<title>abc</title>
</head>
<body>
<input class="btn" type="button" />
<input class="btn" type="button" />
<input class="btn" type="button" />
<script>
for(var i=0;i<3;i++){
document.getElementsByClassName("btn").item(i).onmousedown=function(){
alert(i);
};
}
</script>
</body>
</html> 展开
1个回答
展开全部
for (var i = 0; i < 3; i++) {
(function(i) {
document.getElementsByClassName("btn").item(i).onmousedown = function() {
alert(i);
}
})(i);
}
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