jquery控制textbox只能输入数字的方法

$.fn.numeral = function() {
            $(this).css("ime-mode", "disabled");
            this.bind("keypress", function() {
                if (event.keyCode == 46) {
                    if (this.value.indexOf(".") != -1) {
                        return false;
                    }
                } else {
                    return event.keyCode >= 46 && event.keyCode <= 57;
                }
            });
            this.bind("blur", function() {
                if (this.value.lastIndexOf(".") == (this.value.length - 1)) {
                    this.value = this.value.substr(0, this.value.length - 1);
                } else if (isNaN(this.value)) {
                    this.value = "";
                }
            });

            this.bind("dragenter", function() {
                return false;
            });


        };


 $("#SIZE_OF_PROPERTY_HOUSE").numeral();