Remove duplicate elements from array_javascript tips

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]<script> Array.prototype.distinct = function(){ var $ = this; var o1 = {}; var o2 = {}; var o3 = []; var o; for(var i=0;o = $[i];i++){ if(o in o1){ if(!(o in o2)) o2[o] = o; delete $[i]; }else{ o1[o] = o; } } $.length = 0; for(o in o1){ $.push(o); } for(o in o2){ o3.push(o); } return o3; } var a = [2,2,2,3,3,3,4,4,5,6,7,7]; alert("原数组：" + a); alert("有重复的元素是：" + a.distinct()); alert("整理后的数组是：" + a); alert("整理后的长度是:" + a.length) </script>