问如何比较输入的两个日期？

EN

<script>
    function compareDates() {
        //Get the text in the elements
        var from = document.getElementById('from').textContent;
        var to = document.getElementById('to').textContent;

        //Generate an array where the first element is the year, second is month and third is day
        var splitFrom = from.split('/');
        var splitTo = to.split('/');

        //Create a date object from the arrays
        var fromDate = Date.parse(splitFrom[0], splitFrom[1] - 1, splitFrom[2]);
        var toDate = Date.parse(splitTo[0], splitTo[1] - 1, splitTo[2]);

        //Return the result of the comparison
        return fromDate < toDate;
    }
</script>

<input id="from" type="date" placeholder="dd/mm/yy"><br>
<input id="to" type="date" placeholder="dd/mm/yy">
<button onclick="compareDates()">Compare</button>

 input1 = document.getElementById('from');
 input2 = document.getElementById('to');

 date1 = input1.valueAsDate;
 date2 = input2.valueAsDate;
 console.log(date1 < date2 ? 'valid' : 'invalid');

function compareDate(str){
 // str format should be dd/mm/yyyy. Separator can be anything e.g. / or -. It wont effect
 var dt   = parseInt(str.substring(0,2));
 var mon  = parseInt(str.substring(3,5));
 var yr   = parseInt(str.substring(6,10));
 var date = new Date(yr, mon-1, dt);
 return date;
}

var input1 = compareDate(document.getElementById('from').value);
var input2 = compareDate(document.getElementById('to').value);