Question

这里data console和此data推送了duplicatePushArray，但是一旦推送，我就不想再次推送，但是如果我再次推送，我也想再次显示相同的消息。

例如第一次我再次按下2.jpg,3.jpg，现在再次按下2.jpg,3.jpg，所以它显示了这样的消息2.jpg,3.jpg value is already pushed please change this values，现在再次按下2.jpg,3.jpg，所以它显示了这样的消息，2.jpg,3.jpg,2.jpg,3.jpg value is already pushed please change this values，但是我想显示这样的消息2.jpg,3.jpg value is already pushed please change this values

console.log(data); // (2) [{…}, {…}]0: {imageName: "2.jpg"}1: {imageName: "3.jpg"}
duplicatePushArray : any[] = [];
constructor(private snackBar : MatSnackBar) {}      

for(var i = 0; i < data.length ; i++){
  if(this.duplicatePushArray.indexOf(data[i].imageName)) {
    this.duplicatePushArray.push(data[i].imageName);
    this.snackBar.open(this.duplicatePushArray+' '+ 'value is already pushed please change this values', '',{
      duration: 2000
    })
  }
}

Answer 1

const data = [1,2,3,4,5,6,7,1,2,3,4,1,2];
let duplicatePushArray = [];
for(let i = 0; i < data.length ; i++){
  if(duplicatePushArray.indexOf(data[i]) === -1) {
    duplicatePushArray.push(data[i]);
  } else {
    console.log(`${data[i]} is already pushed into array`);
  }
}

console.log('Final Array: ', duplicatePushArray)

Angular：如何停止重复项推入数组？

1 个答案: