<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Set（交集、並集、差集）</title> </head> <body> </body> </html> <script type="text/javascript"> var set1=new Set([1,2,1,2,1,2,true,NaN,true,"1","1"]); //得到一個去重後的類數組(類似數組的對象) //只有值value沒有鍵key的對象 console.log(set1); //size 個數 //add console.log(set1.add(10)); //has console.log(set1.has(1)); //delete true/false console.log(set1.delete(1));;js知識點 console.log(set1); //clear 沒有返回值 set1.clear(); console.log(set1); var ary=[1,2,1,2,1,2,true,NaN,true,"1","1"]; console.log([...new Set(ary)]); var ary1=[1,2,4,6,8]; var ary2=[1,3,5,6,7,8]; //並集 function bingJi(ary1,ary2) { return [...new Set([...ary1,...ary2])].sort(); } console.log(bingJi(ary1, ary2)); //交集 function jiaoJi(ary1,ary2) { return ary1.filter(function (item) { return ary2.includes(item) }) } console.log(jiaoJi(ary1, ary2)); //差集(並集-交集) function chaJi(ary1,ary2) { return bingJi(ary1,ary2).filter(function (item) { return !jiaoJi(ary1,ary2).includes(item); }) } console.log(chaJi(ary1, ary2)); var map=new Map([["a","a"],["b","b"]]); console.log(map); </script>
Set（交集、並集、差集）
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