TypeScript - Angular：多行字符串

Question

我是 Angular 2 初学者，我已经在我的 dev/app.component.ts 中编写了这段代码：

import {Component} from 'angular2/core';

@Component({
    selector: 'my-app',
    template: '<h3 (click)="onSelect()"> {{contact.firstName}} {{content.lastName}}</h3>'
})
export class AppComponent {
    public contact = {firstName:"Max", lastName:"Brown", phone:"3456732", email:"max88@gmail.com"};

    public showDetail = false;
    onSelect() {
        this.showDetail=true;
    }
}

当我转到浏览器“显示 Max Brown”时，它可以工作。

现在，我想将模板部分写在不同的行上，如下所示：

import {Component} from 'angular2/core';

@Component({
    selector: 'my-app',
    template: '<h3 (click)="onSelect()">
    {{contact.firstName}} {{contact.lastName}}<h3>'
})
export class AppComponent {
    public contact = {firstName:"Max", lastName:"Brown", phone:"3456732", email:"max88@gmail.com"};

    public showDetail = false;
    onSelect() {
        this.showDetail=true;
    }
}

但我在 Chrome 控制台中收到此错误：

Uncaught TypeError: Cannot read property 'split' of undefined

Answer 1

仅当我们希望在字符串中添加 \n 时，接受的答案才有效，如果我们只是希望内容在换行符上而不在长字符串中添加 \n，请在每一行的末尾添加 \ 像这样

string firstName = `this is line 1 \
and this is line 2 => yet "new line" are not \
included because they were escaped with a "\"`;

console.assert(firstName == 'this is line 1 and this is line 2 => yet "new line" are not included because they were escaped with a "\"'); // true

注意 - 确保您没有在下一行（示例中的第二行）开头添加任何制表符和空格

Answer 2

使变量如下

firstName ='';
lastName = '';

Answer 3

这个呢？这将解决新行中的空白。但可能有点不可读并且会影响性​​能。

    let myString =
      `multi${""
      }line${""
      }string`;

Answer 4

将文本括在`（反引号）而不是单引号'，然后它可以跨越多行。

var myString = `abc
def
ghi`;