我设法让它以一种不同的方式工作，通过检查charCode和一个keyup函数，用逗号替换圆点。

<input class="form-control price_field" onkeypress="return isNumberKey(this, event);" type="text" id="price_search" name="price_search">

    function isNumberKey(txt, evt) {
        var charCode = (evt.which) ? evt.which : evt.keyCode;
        if (charCode == 44) {
            //check if previously there was a decimal
            if (txt.value.indexOf('.') > 0) {
                return false;
            }
            //Check if the text already contains the , character
            if (txt.value.indexOf(',') === -1) {
                return true;
            } else {
                return false;
            }
        } else if(charCode == 46){
            //check if previously there was a comma
            if (txt.value.indexOf(',') > 0) {
                return false;
            }
            if (txt.value.indexOf('.') === -1) {
                return true;
            } else {
                return false;
            }
        } else {
            if (charCode > 31 &&
            (charCode < 48 || charCode > 57))
            return false;
        }
        return true;
    }

    $(".price_field").on("keyup", checkKey);

    function checkKey() {
        if (this.value.indexOf('.') > 0) {
            this.value = this.value.replace(".", ",");
        }
    }