无法读取属性"push"未定义 [英] Cannot read property "push" of undefined

问题描述

当我尝试将值推入数组时出现错误.该错误的神秘之处在于它仅在Ionic Dev App上发生，而在Google Chrome控制台中，一切运行正常.

I have an error when I try to push a value in an array. The mystic thing in this error is that it only occurs on the Ionic Dev App, whereas in the Google Chrome Console, everything works perfectly.

我确实初始化了数组，所以错误不是从这里来的.也许错误是由于异步操作引起的，但是我看不到我没有兑现承诺的地方...

I did initialize the array, so the error doesn't come from here. Maybe, the error comes from an asynchronous operation, but I don't see where I don't catch a promise...

initModelesList(){
  this.addModele = this.navParams.get('addModele') || false;
  this.deleteModele = this.navParams.get("deleteModele") || false;
  if (!!this.addModele){
    this.modelesList.push(this.addModele); //error here
    this.saveModelesList();
  }
  if (!!this.deleteModele){
    const index: number = this.modelesList.indexOf(this.deleteModele);
    if (index !== -1){
      this.modelesList.splice(index,1)
    }
    this.saveModelesList()
  }
}
saveModelesList(){
 this.storage.set('modelesList',this.modelesList)
}
getModelesList(){
  this.storage.get('modelesList').then((modelesList) => {
    this.modelesList=modelesList;
    this.initModelesList()
  },()=>{
    this.modelesList=[];
    this.initModelesList();
  })
}

这是Ionic Dev App上错误的屏幕截图.

Here's a screenshot of the error on the Ionic Dev App.

推荐答案

确保已初始化 modelesList

Make sure you have initialized modelesList

您可以显式检查它是否不为null并根据需要创建一个:

You can explicitly check if it's not null and create one if needed:

this.modelesList= this.modelesList|| [];

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