javascript控制小数点精度

function on_KeyPress() {

        var value=event.srcElement.value;

        var kc=event.keyCode;

        if(kc<32 || (kc>47 && kc<58) || (kc==45 && value.indexOf("-")==-1) || (kc==46 && value.indexOf(".")==-1)) {

                return true;

        }

        return false;

}

 

function on_KeyUp() {

        var obj=event.srcElement;

        var value=obj.value;

        var re=/(..{1}).+$/;    //小数点后1为

        if(value.indexOf("-")>0) {

                obj.value=value.replace("-","");

        } else if(re.test(value)) {

                obj.value=value.replace(re,"$1");

        }        

}