<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Document</title> </head> <body> <input type="button" value="数组去重1" οnclick="show()"> <input type="button" value="数组去重2" οnclick="run()"> <input type="button" value="数组去重3" οnclick="qq()"> <input type="button" value="数组去重4" οnclick="spl()"> </body> </html> <script type="text/javascript"> //方法一 console.time() function has(arr,num){ for(var i=0;i<arr.length-1;i++){ if(arr[i]==num){ return true; } } return false; } function norepeat(arr){ var newarr=[]; for(var i=0;i<arr.length-1;i++){ if(has(newarr,arr[i])==false){ newarr.push(arr[i]); } } return newarr; } function show(){ var arr=[4,6,4,7,3,7,5,8,9,10]; alert(norepeat(arr)); } console.timeEnd() //方法二 console.time() function nore(arr){ var newarr=[]; for(var i=0;i<arr.length;i++){ if(newarr.indexOf(arr[i])<0){ newarr.push(arr[i]); } } return newarr; } function run(){ var arr=[4,6,4,7,3,7,5,8,9,10]; alert(nore(arr)); } console.timeEnd() //方法三 console.time() function qq(arr){ var arr=[4,6,4,7,3,7,5,8,9,10]; var arr1=new Set(arr); arr1=Array.from(arr1); alert(arr1); } console.timeEnd() //方法四 console.time() function norepeat1(arr){ for(var i=0;i<arr.length;i++){ for(var j=i+1;j<arr.length;j++){ if(arr[i]==arr[j]){ arr.splice(j,1); j--; } } } return arr; } function spl(){ var arr=[4,6,4,7,3,7,5,8,9,10]; alert(norepeat1(arr)) } console.timeEnd() </script>
