JQ 限制文本框 数字 小数 字母

最近在项目中要控制文件框的输入，Google了一下，找到一些方法。并修改。以下代码经过验证，可以正常使用。

// ----------------------------------------------------------------------
// <summary>
// 文本框只能输入数字(不包括小数)，并屏蔽输入法和粘贴
// </summary>
// ----------------------------------------------------------------------
$.fn.integer = function () {
    this.bind("keypress", function (e) {
        var code = (e.keyCode ? e.keyCode : e.which); //兼容火狐 IE
        if (!$.browser.msie && (e.keyCode == 0x8)) { //火狐下不能使用退格键
            return;
        }
        return code >= 48 && code <= 57;
    });
    this.bind("paste", function () {
        return false;
    });
    this.bind("keyup", function () {
        if (/(^0+)/.test(this.value)) {
            this.value = this.value.replace(/^0*/, ‘‘);
        }
    });
    this.bind("focus", function () {
        this.style.imeMode = ‘disabled‘;
    });
    this.bind("blur", function () {
        var reg = /^\d{1,}$/;
        if (this.value.slice(-1) == "") {
            this.value = "0";
        }
        if (reg.test(this.value) === false) {
            this.value = "0";
        }
    });
};

// ----------------------------------------------------------------------
// <summary>
// 文本框只能输入数字(包括小数)，并屏蔽输入法和粘贴
// </summary>
// ----------------------------------------------------------------------
$.fn.number = function () {
    this.bind("keypress", function (e) {
        var code = (e.keyCode ? e.keyCode : e.which); //兼容火狐 IE
        if (!$.browser.msie && (e.keyCode == 0x8)) { //火狐下不能使用退格键
            return;
        }
        if (this.value.indexOf(".") == -1) {
            return (code >= 48 && code <= 57) || (code == 46);
        } else {
            return code >= 48 && code <= 57
        }
    });
    this.bind("paste", function () {
        return false;
    });
    this.bind("keyup", function () {
        if (this.value.slice(0, 1) == ".") {
            this.value = "";
        }
    });
    this.bind("focus", function () {
        this.style.imeMode = ‘disabled‘;
    });
    this.bind("blur", function () {
        var reg = /^-?[^\D]+\.?[^\D]{1,4}$/;
        if (this.value.slice(-1) == ".") {
            this.value = this.value.slice(0, this.value.length - 1);
        }
        if (this.value.slice(-1) == "") {
            this.value = "0";
        }
        if (reg.test(this.value) === false) {
            this.value = "0";
        }
    });
};

// ----------------------------------------------------------------------
// <summary>
// 限制只能输入字母
// </summary>
// ----------------------------------------------------------------------
$.fn.onlyAlpha = function () {
    this.bind("keypress", function (event) {
        var eventObj = event || e;
        var keyCode = eventObj.keyCode || eventObj.which;
        if ((keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122))
            return true;
        else
            return false;
    });
    this.bind("paste", function () {
        var clipboard = window.clipboardData.getData("Text");
        if (/^[a-zA-Z]+$/.test(clipboard))
            return true;
        else
            return false;
    });
    this.bind("focus", function () {
        this.style.imeMode = ‘disabled‘;
    });
};

// ----------------------------------------------------------------------
// <summary>
// 限制只能输入数字和字母
// </summary>
// ----------------------------------------------------------------------
$.fn.onlyNumAlpha = function () {
    this.bind("keypress", function (event) {
        var eventObj = event || e;
        var keyCode = eventObj.keyCode || eventObj.which;
        if ((keyCode >= 48 && keyCode <= 57) || (keyCode >= 65 && keyCode <= 90) || (keyCode >= 97 && keyCode <= 122))
            return true;
        else
            return false;
    });
    this.bind("paste", function () {
        var clipboard = window.clipboardData.getData("Text");
        if (/^(\d|[a-zA-Z])+$/.test(clipboard))
            return true;
        else
            return false;
    });
    this.bind("focus", function () {
        this.style.imeMode = ‘disabled‘;
    });
};

使用方法以：

$("#Id").integer();
$("#Id").number();
$("#Id").onlyAlpha();
$("#Id").onlyNumAlpha();