每日面试题3

1.数组去重

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function qc(arr2){     let arr = [];     for( let i = 0; i < arr1.length; i++) {         if( arr.indexOf(arr1[i]) == -1) {             arr.push(arr1[i])         }     }     return arr; } arr1 = ["1","1","3","5","2","24","4","4","a","a","b"];           console.log(qc(arr1));