easyui 时间段校验，开始时间小于结束时间，并且时间间隔不能超过30天

//对easyui datetimebox的验证，开始时间要小于结束时间
function validateDateTime(beginTimeId,endTimeId,whichTimeId)

{

console.log("hello world");

var v1=$('#'+beginTimeId).datetimebox("getValue");

var date1 = new Date(v1);

var v2=$('#'+endTimeId).datetimebox("getValue");

var date2 = new Date(v2);
</span><span style="color: #0000ff;">if</span>(v1==''||v2==''<span style="color: #000000;">)
{
    </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;
}    
console.log(date1);
console.log(date2);
</span><span style="color: #0000ff;">if</span>(date1&lt;<span style="color: #000000;">date2)
{
    console.log(date1</span>+"&lt;"+<span style="color: #000000;">date2);
    </span><span style="color: #0000ff;">var</span> diff=<span style="color: #000000;">DateDiff(date1,date2);
    </span><span style="color: #0000ff;">if</span>(diff&gt;30<span style="color: #000000;">)
    {
        $.messager.alert(</span>'提示','时间段不能超过30天！'<span style="color: #000000;">);
        $(</span>'#'+whichTimeId).datetimebox("setValue",""<span style="color: #000000;">);
    }
    </span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">true</span><span style="color: #000000;">;
}
console.log(date1</span>+"!&lt;"+<span style="color: #000000;">date2);
</span><span style="color: #0000ff;">try</span><span style="color: #000000;">{
    $(</span>'#'+whichTimeId).datetimebox("setValue",""<span style="color: #000000;">);
}</span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e){
}
</span><span style="color: #0000ff;">try</span><span style="color: #000000;">{
    $(</span>'#'+whichTimeId).datebox("setValue",""<span style="color: #000000;">);
}</span><span style="color: #0000ff;">catch</span><span style="color: #000000;">(e){
}

$.messager.alert(</span>'提示','开始时间要小于结束时间！'<span style="color: #000000;">);

</span><span style="color: #0000ff;">return</span> <span style="color: #0000ff;">false</span><span style="color: #000000;">;       

}

示例：

        $('#fssjFrom1').datetimebox({
            onHidePanel: function(date){
                validateDateTime('fssjFrom1','fssjTo1','fssjFrom1');
            }
        });
        $('#fssjTo1').datetimebox({
            onHidePanel: function(date){
                validateDateTime('fssjFrom1','fssjTo1','fssjTo1');
            }
        });