Angular 2 模板解析错误 Missing expected )

Question

我收到以下异常:

Unhandled Promise rejection: Template parse errors:
Parser Error: Missing expected ) at column 19 in [(model.DaysOfWeek & 0x20) !== 0] in PriceComponent@129:65 ("ox">
                    <label>
                        <input type="checkbox" name="DaysOfWeek" [ERROR ->][checked]="(model.DaysOfWeek & 0x20) !== 0" (change)="model.DaysOfWeek ^= 0x20" /> Monday
          "): PriceComponent@129:65

在这个绑定(bind)上:

<input type="checkbox" name="DaysOfWeek" [checked]="(model.DaysOfWeek & 0x20) !== 0" (change)="model.DaysOfWeek ^= 0x20" /> Monday

绑定(bind)表达式对我来说看起来有效，所以我很困惑为什么它会失败？ DaysOfWeek 是数字类型的属性，使用星期几标志进行位编码。

Answer 1

请注意，在 Template expressions 中和 Template statements它不允许按位运算符 |和&:

模板表达式

no support for the bitwise operators | and &

模板语句

However, certain JavaScript syntax is not allowed:

• new
• increment and decrement operators, ++ and -- operator assignment, such as += and -=
• the bitwise operators | and &
• the template expression operators