var arr1 = ["i", "b", "c", "d", "e", "f","x"]; //數(shù)組A var arr2 = ["a", "b", "c", "d", "e", "f", "g"];//數(shù)組B var temp = []; //臨時數(shù)組1 var temparray = [];//臨時數(shù)組2 for (var i = 0; i < arr2.length; i++) { temp[arr2[i]] = true;//巧妙地方：把數(shù)組B的值當(dāng)成臨時數(shù)組1的鍵并賦值為真 }; for (var i = 0; i < arr1.length; i++) { if (!temp[arr1[i]]) { temparray.push(arr1[i]);//巧妙地方：同時把數(shù)組A的值當(dāng)成臨時數(shù)組1的鍵并判斷是否為真，如果不為真說明沒重復(fù)，就合并到一個新數(shù)組里，這樣就可以得到一個全新并無重復(fù)的數(shù)組 } ; }; document.write(temparray.join(",") + "");