Javascript：跳转到指定页面

<div>

    <input type="text" id="jumpPage"/>
    <input type="button" value="GO" onclick="Jump();" />
    Total Pages:<input type="text" id="totalPages" value="{{ pages }}" />
</div>
<script>
    function Jump() {
        var val = document.getElementById('jumpPage').value.trim()
        var totalPages = document.getElementById('totalPages').value.trim()
        if(isNaN(val) ||  Number(val)<1 || Number(val)>Number(totalPages)||!(val.search(/\D/)===-1)){
            alert("Please input a right page number")
            document.getElementById('jumpPage').value = null
            return false
        }else{
            location.href = "/index/"+val
        }
    }
</script>