本文實例講述了JavaScript獲取兩個數組交集的方法。分享給大家供大家參考。具體如下：
這裡傳入的數組必須是已經排過序的
/* finds the intersection of
* two arrays in a simple fashion.
*
* PARAMS
* a - first array, must already be sorted
* b - second array, must already be sorted
*
* NOTES
*
* Should have O(n) operations, where n is
* n = MIN(a.length(), b.length())
*/
function arrayIntersection(a, b)
{
var ai=0, bi=0;
var result = new Array();
while( ai < a.length && bi < b.length )
{
if (a[ai] < b[bi] ){ ai++; }
else if (a[ai] > b[bi] ){ bi++; }
else /* they're equal */
{
result.push(a[ai]);
ai++;
bi++;
}
}
return result;
}
console.log(arrayIntersection([1,2,3],[2,3,4,5,6]));//[2,3]
希望本文所述對大家的javascript程序設計有所幫助。