开始学习Angular 5并且遇到了bitMask = bitMask / 0xf;
//bitMask is now 0x1010
//do some bit manipulation with bitmask
//get nybbleMask == 0xc (0b1010)
指令。我试图根据条件应用多个类,但不知何故只应用了1/2类。
mainnav.component.html
math.h
mainnav.component.ts
ngClass
条件似乎工作正常,但我不确定为什么没有添加一个类,如下面的截图所示,
有人知道我对<nav class="navbar navbar-expand-lg fixed-top"
[ngClass]="{
'navbar-dark bg-dark' : themeColor === 'dark',
'navbar-dark bg-primary' : themeColor === 'blue',
'navbar-light bg-light' : themeColor === 'light'
}">
...
...
<li class="nav-item">
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search" (keyup)="onButtonClicked($event)">
<button class="btn btn-outline-success my-2 my-sm-0" [disabled]="!allowSearch" type="submit">Search</button>
</form>
</li>
<li class="nav-item dropdown" (mouseover)="openDropDown($event)">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Change Theme
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#" (click)="enableDarkTheme()">Dark</a>
<a class="dropdown-item" href="#" (click)="enableLightTheme()">Light</a>
<a class="dropdown-item" href="#" (click)="enableBlueTheme()">Blue</a>
</div>
</li>
的使用是否错误?
答案 0 :(得分:1)
Angular GitHub回购中有一个previous bug report关于这个话题。
原因是[ngClass]
会为解析为true
的类添加类,并为那些解析为false
的类添加类。您在多种情况下使用相同的类来创建问题。