javascript 在3个数字之间添加分隔符，并允许它们之间移动。将光标移到好位置

Posted 2021-05-04

function humanizeNumber(id,number) {
        
        //Get the cursor position
        var start = document.getElementById(id).selectionStart;
        var end = document.getElementById(id).selectionEnd;
 
        //Replace the space in number, and add again to the right position
        numberString = number.replace(/\s/g, '');
        value = (String(numberString).replace(/(.)(?=(\d{3})+$)/g,'$1 '));
 
        //If the space were added, it move the cursor position +1
        if(document.getElementById(id).value.length!=value.length)
        {
            start += 1;
            end +=1;
        }
 
        //If the key pressed aren't arrowRight and arrowLeft, write the new value
        var event = window.event ? window.event : e;
        if(event.keyCode!=37 && event.keyCode!=39)
        {
            document.getElementById(id).value = value;
            document.getElementById(id).setSelectionRange(start, end);
        }
    }