標籤：for reset 反選 put 功能 == ++ 練習 全選
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>頁面上有10個多選框，實現三個按鈕(重設、反選、全選)功能</title>
</head>
<body>
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<input type="checkbox">
<button id="reset">重設</button>
<button id="invert">反選</button>
<button id="all">全選</button>
<script>
var reset=document.getElementById(‘reset‘);
var invert=document.getElementById(‘invert‘);
var all=document.getElementById(‘all‘);
var checkBox=document.getElementsByTagName(‘input‘);
reset.addEventListener(‘click‘,function () {
for(var i=0;i<checkBox.length;i++){
checkBox[i].checked=false;
}
});
invert.addEventListener(‘click‘,function () {
for(var i=0;i<checkBox.length;i++){
/*if(checkBox[i].checked==true){
checkBox[i].checked=false;
}else {
checkBox[i].checked=true;
}*/
checkBox[i].checked = !checkBox[i].checked
}
});
all.addEventListener(‘click‘,function () {
for(var i=0;i<checkBox.length;i++){
checkBox[i].checked=true;
}
})
</script>
</body>
</html>
js小練習——頁面實現重設、反選、全選三個按鈕的功能
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