js中什么是自定义react数据验证组件（详细说明）

我们在做前端表单提交时，经常会遇到要对表单中的数据进行校验的问题。如果用户提交的数据不合法，例如格式不正确、非数字类型、超过最大长度、是否必填项、最大值和最小值等等，我们需要在相应的地方给出提示信息。如果用户修正了数据，我们还要将提示信息隐藏起来。

有一些现成的插件可以让你非常方便地实现这一功能，如果你使用的是knockout框架，那么你可以借助于Knockout-Validation这一插件。使用起来很简单，例如我下面的这一段代码：

ko.validation.locale('zh-CN');
ko.validation.rules['money'] = {
    validator: function (val) {        
       if (val === '') return true;        return /^\d+(\.\d{1,2})?$/.test(val);
    },
    message: '输入的金额不正确'};
ko.validation.rules['moneyNoZero'] = {
    validator: function (val) {        
        if (val === '') return true;        return isNaN(val) (专业提供视频软件下载)

 
   (专业提供视频软件下载)

 
    val != 0;
    },
    message: '输入的金额不能为0'};
ko.validation.registerExtenders();var model = {
    MSRP: ko.observable(0),
    price: ko.observable().extend({ required: true, number: true, min: 10000, money: true, moneyNoZero: true }),
    licence_service_fee: ko.observable().extend({ required: true, money: true }),
    purchase_tax: ko.observable().extend({ required: true, money: true }),
    vehicle_tax: ko.observable().extend({ required: true, money: true }),
    insurance: ko.observable().extend({ required: true, money: true }),
    commercial_insurance: ko.observable().extend({ required: true, money: true }),
    mortgage: ko.observable(''),
    interest_discount: ko.observable(''),
    allowance: ko.observable().extend({ money: true }),
    special_spec_fee_explain: ko.observable(''),
    has_extra_fee: ko.observable(false),
    is_new_energy: ko.observable(false)
};

model.extra_fee_explain = ko.observable().extend({
    required: {
        onlyIf: function () {            
           return model.has_extra_fee() === true;
        }
    }
});

model.extra_fee = ko.observable().extend({
    required: {
        onlyIf: function () {           
            return model.has_extra_fee() === true;
        }
    },
    money: {
        onlyIf: function () {            
            return model.has_extra_fee() === true;
        }
    }
});

model.new_energy_allowance_explain = ko.observable().extend({
    required: {
        onlyIf: function () {            
            return model.is_new_energy() === true;
        }
    }
});

model.total_price = ko.computed(function () {   
   var _total = Number(model.price()) + Number(model.licence_service_fee()) +Number(model.purchase_tax()) + Number(model.vehicle_tax()) +Number(model.insurance()) + Number(model.commercial_insurance());    
        if (model.has_extra_fee()) {
        _total += Number(model.extra_fee());
    }    
    if (model.is_new_energy()) {
        _total -= Number(model.new_energy_allowance());
    }    
    return isNaN(_total) ? '0' : _total.toFixed(2).replace(/(\.0*$)(专业提供视频软件下载)

 
   (0*$)/, '');
});

model.errors = ko.validation.group(model);
ko.applyBindings(model);