只能输入数字，汉字等...

调用的时候使用 onkeydown="return functionName(this,event.keyCode)"

禁止使用粘贴功能 onpaste = "return false;"

浮点型

//只能输入浮点型function PositiveDoble(element, keyCode){    if (keyCode == 9 || keyCode == 116 || (keyCode >= 35 && keyCode <= 40))    {        return true;    }    if ($(element).val().length >= 1 && $(element).val() != "-" && $(element).val().toString().lastIndexOf(".") < 0 && keyCode == 110) {        return true;    }    //输入00    if ($(element).val().length == 1 && $(element).val()=="0" && (keyCode == 96 || keyCode == 48)) {        return false;    }    //输入-0    if ($(element).val().length == 2 && $(element).val() == "-0" && (keyCode == 96 || keyCode == 48)) {        return false;    }    if ($(element).val().length == 0 && (keyCode == 189 || keyCode == 109)) {        return true;    }    if ($(element).val().length == 0 && (keyCode == 96 || keyCode == 48)) {        return true;    }    return (keyCode >= 96 && keyCode <= 105 || keyCode == 8 || (keyCode >= 48 && keyCode <= 57));}

//只能输入正整数function PositiveInteger(element, keyCode) {    if (keyCode == 9 || keyCode == 116 || (keyCode >= 35 && keyCode <= 40)) {        return true;    }    if ($(element).val().length == 0 && (keyCode == 96 || keyCode==48))    {        return false;    }    return (keyCode >= 96 && keyCode <= 105 || keyCode == 8 || (keyCode >= 48 && keyCode <= 57));}

//只能输入英文+空格function PositiveEnglish(keyCode){    if (keyCode == 9 || keyCode == 116 || (keyCode >= 35 && keyCode <= 40)) {        return true;    }    return ((keyCode >= 65 && keyCode <= 90) || keyCode == 32 || keyCode==8);}

//带负号的整数function PositiveInteger2(element, keyCode) {    if ($(element).val().length == 1 && $(element).val() != "-" && $(element).val() != "0" && (keyCode == 96 || keyCode == 48)) {        return true;    }    if (keyCode == 9 || keyCode == 116 || (keyCode >= 35 && keyCode <= 40)) {        return true;    }    if ($(element).val().length == 0 && (keyCode == 189 || keyCode == 109)) {        return true;    }    if ($(element).val().length == 0 && (keyCode == 96 || keyCode == 48)) {        return true;    }    if ($(element).val().length == 1 && (keyCode == 96 || keyCode == 48)) {        return false;    }    return (keyCode >= 96 && keyCode <= 105 || keyCode == 8 || (keyCode >= 48 && keyCode <= 57));}

中文这里 使用 keypup="functionname(this)"

//只能输入中文function PositiveChina(element) {    $(element).val($(element).val().replace(/[^\u4e00-\u9fa5]/g, ''));}