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getElementsByTagName.html
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47 lines (40 loc) · 1.38 KB
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>getElementsByTagName</title>
<script type="application/javascript">
function checkAll(){
//getElementsByTagName 返回多个dom对象集合
var hobbys=document.getElementsByTagName("input")
for(var index=0;index<hobbys.length;index++){
// alert(hobbys[index]+" "+hobbys[index].checked);
// alert(hobbys[index].checked);
hobbys[index].checked=true;
}
};
function checkNo(){
var hobbys=document.getElementsByTagName("input")
for(var index=0;index<hobbys.length;index++){
hobbys[index].checked=false;
}
};
function checkReverse(){
var hobbys=document.getElementsByTagName("input")
for(var index=0;index<hobbys.length;index++){
hobbys[index].checked=!(hobbys[index].checked);
}
};
</script>
</head>
<body>
兴趣爱好：<br>
<input type="checkbox" value="cpp">CPP<br>
<input type="checkbox" value="Java">Java<br>
<input type="checkbox" value="C++">C++<br>
<input type="checkbox" value="JavaScript">JavaScript<br>
<button onclick="checkAll()">全选</button>
<button onclick="checkNo()">全部选</button>
<button onclick="checkReverse()">反选</button>
</body>
</html>