Question

我需要在typescript对象数组中添加值

如果数组是

的示例

[
   {'title':'this is post title1','content':'this is post content1'},
   {'title':'this is post title2','content':'this is post content2'},
   {'title':'this is post title3','content':'this is post content3'},
   {'title':'this is post title4','content':'this is post content4'},
   {'title':'this is post title5','content':'this is post content5'},
]

我希望当我把新项目放在这个数组的第一个中时，比如jQuery中的prepend

[
   {'title':'this is new item title','content':'this is new item content'},
   {'title':'this is post title1','content':'this is post content1'},
   {'title':'this is post title2','content':'this is post content2'},
   {'title':'this is post title3','content':'this is post content3'},
   {'title':'this is post title4','content':'this is post content4'},
   {'title':'this is post title5','content':'this is post content5'},
]

提前致谢

Answer 1

使用jquery无法完成，因为它的功能属于javascript数组对象。

您可以使用数组函数unshift()。

Answer 2

您可以使用...运算符

例如：

 let myArray = [ 1,2,3,4,5 ];
 myArray = [0, ...myArray];

Answer 3

您可以使用unshift将项目添加到数组中：

const myArray = [ 2, 3, 4 ]

myArray.unshift(1)

console.log(myArray); // [ 1, 2, 3, 4 ]

您可以在此处找到文档：https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/unshift

Answer 4

你可以用拼接来解决它。

arr.splice(index, 0, item);

From another SO question

如何在打字稿中将新项目添加到数组中

4 个答案: