// 方法一:var arr1 =[1,2,2,2,3,3,3,4,5,6],arr2 = [];for(var i = 0,len = arr1.length; i< len; i++){if(arr2.indexOf(arr1[i]) < 0){arr2.push(arr1[i]);}}document.write(arr2); // 1,2,3,4,5,6
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