實現數字加減
阿新 • • 發佈：2019-01-19
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
</head>
<body>
<div class="spinner">
<input type="text" readonly="readonly" value="1" id="t1" />
<div class="arrow"><a onclick="addminus('t1')">+</a><a onclick="addminus('t1', true)">-</a></div>
</div>
<script>
function addminus(id, add) {
var t = document.getElementById(id),
v = parseInt(t.value) || 0;
add ? v++ : v--;
if(v>=0){
t.value = v;
}
}
</script>
</body>
</html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title></title>
</head>
<body>
<div class="spinner">
<input type="text" readonly="readonly" value="1" id="t1" />
<div class="arrow"><a onclick="addminus('t1')">+</a><a onclick="addminus('t1', true)">-</a></div>
</div>
<script>
function addminus(id, add) {
var t = document.getElementById(id),
v = parseInt(t.value) || 0;
add ? v++ : v--;
if(v>=0){
t.value = v;
}
}
</script>
</body>
</html>