<input type=text id=a1>
<button onclick=check(a1.value)>Check</button>
<script>
function check(para){
re = /^-?(60|([1-5]\d)|(\d))$/;
alert(re.test(para));
}
</script>
<button onclick=check(a1.value)>Check</button>
<script>
function check(para){
re = /^-?(60|([1-5]\d)|(\d))$/;
alert(re.test(para));
}
</script>
<button onclick=check(a1.value)>Check</button>
<script>
function check(para){
re = /^-?(60|([1-5]\d)|(\d))(\.\d+)?$/;
alert(re.test(para));
}
</script>