let a=[{a:1,b:2},{a:'',b:2},{a:11},{a:11,b:''},{a:'',b:999},{b:132},{a:'',b:99},{a:'',b:90},{a:'',b:''},{a:''},{b:''},{a:1,b:''}]
let b =[];
let d;
 
for (let index = 0; index < a.length; index++) {
  for (const key in a[index]) {
    if(a[index][key] === '')  b.push(a[index])
  }
}
d = [...a,...b]
function deWeight(arr) {
  for (var i = 0; i < arr.length - 1; i++) {
      for (var j = i+1; j < arr.length; j++) {
          if (arr[i].a === arr[j].a ||arr[j].a ===''||arr[i].a ===''|| arr[i].b === arr[j].b || arr[j].b ===''|| arr[i].b ==='' ) {
              arr.splice(j, 1);
              j--;
          }
      }
  }
  return arr;
}
var newArr = deWeight(d);
console.log(newArr);