无法将类型分配给角度字符串

Question

大家好，我需要帮助，我无法将字符串属性推送到键、值数组； 我有

         selRoles!: Array<{name:string}>;



  // then i try to map the role.names to the typed Array<{name:string}>.because the map function returns an Array<string> without the type name? 
  this.selRoles = data.roles.map(role => role.name);

  //here is my subscribe method which returns some rest data
  this.userService.getUserById(this.id).subscribe(data => {
        this.user = data; 
      // i also tried to use forEach with type like this

      data.roles.forEach(role => this.selRoles.push({name:role.name}));
      console.log("selRoles " +this.selRoles.forEach(item => item.name));
}, 
error => console.log(error)
)

总是有一个错误，VC代码描述如下 'string' 类型的参数不能分配给 '{ name: string; 类型的参数； }'.ts(2345)

如何将类型指定为字符串的属性？你能帮我吗。非常感谢。谢谢

Answer 1

您的代码存在两个问题。首先this.selRoles.forEach return void。其次data.roles.map(role => role.name) 我会返回["string, "string", "string"]，你需要改一下。

这是你需要做的：

selRoles!: Array<{name:string}>;

this.selRoles = data.roles.map(role => {return {name: role.name}});

  this.userService.getUserById(this.id).subscribe(data => {
        this.user = data; 
     

      data.roles.forEach(role => this.selRoles.push({name:role.name}));
      console.log("selRoles " +this.selRoles.map(item => item.name).join(", "));
}, 
error => console.log(error)
)