function test() {
let array = [];
array.push({zbz: '131624', yd: '201910'});
array.push({zbz: '146553', yd: '201911'});
array.push({zbz: '157479', yd: '202007'});
array.push({zbz: '153000', yd: '202008'});
array.push({zbz: '155775', yd: '202109'});
array.push({zbz: '39121', yd: '202110'});
array.push({zbz: '1234', yd: '20210710'});
array.push({zbz: '123', yd: '20210709'});
array.push({zbz: '123', yd: '20200710'});
let newArray = [];
for (let i = 0; i < array.length; i++) {
let b = false;
const obj = array[i];
for (let i = 0; i < newArray.length; i++) {
const obj1 = newArray[i]
if (obj1.yd === obj.yd.substr(0, 4)) {
obj1.zbz = parseFloat(obj.zbz) + parseFloat(obj1.zbz) + '';
b = true;
break;
}
}
if (!b) {
newArray.push({zbz: obj.zbz, yd: obj.yd.substr(0, 4)});
}
}
console.log(newArray);
}