js 數組判斷兩個數組的值部分相等判斷

for (let i = 0; i <= this.etc.length - 1; i++) {
for (let j = 0; j <= this.dayArr.length - 1; j++) {

if (this.etc[i].beginTime == this.dayArr[j].date) {
this.dayArr[j].price = this.etc[i].activePrice
}
}

 

}