我要将数字从1递增到50。
我尝试使用此代码,如下所示,但是功能不起作用。
在html中,我有:
<Button text="+" (tap)="plus()"></Button>
<Button text="-" (tap)="minus()"></Button>
在ts中,我必须发挥作用,如下所示:
plus() {
var first: number = 1;
var last: number = 50;
let num = first + 1
console.log("Value of num1 after increment ", first)
if (num === last) {
console.log('disable')
} else {
console.log('num plus', num)
}
}
minus() {
var first1: number = 1;
var last1: number = 50;
let num1 = first1 - 1
console.log("Value of num1 after decr ", first1)
if (num1 === last1) {
console.log('disable')
} else {
console.log('num minus', num1)
}
}
请问有什么想法,如何增加/减少数字?
答案 0 :(得分:0)
在plus()
和minus()
方法之外声明变量。我猜first
和last
的数字是不变的。
app.component.ts:
export class AppComponent {
name = "Angular";
last1 = 50;
last2 = -50;
num1 = 0;
num2 = 0;
plus() {
if (this.num1 === this.last1) {
console.log("disable");
} else {
this.num1++;
console.log("Value of num1 after increment ", this.num1);
}
}
minus() {
if (this.num2 === this.last2) {
console.log("disable");
} else {
this.num2--;
console.log("Value of num1 after decr ", this.num2);
}
}
}
app.component.html:
<Button (click)="plus()" class="btn">+</Button>
<Button (click)="minus()" class="btn">-</Button>
<p>Num1: {{num1}}</p>
<p>Num2: {{num2}}</p>