JS数组操作中的经典算法实例讲解

<script type="text/javascript">var arr = [3,7,6,2,1,5];定义一个交换使用的中间变量var temp = 0;for(i=0;i<arr.length;i++){  for(j=0;j<arr.length;j++){如果下一个元素小于当前元素    if(arr[j]>arr[j+1]){互换      temp = arr[j];      arr[j] = arr[j+1];      arr[j+1] = temp;      }    }  }  for(var i in arr){       document.write(arr[i]);      }</script>

<script type="text/javascript">//老数组var arr1 = [1,2,2,3,8,6,6,4,5,5];//定义新数组var arr2 = [];for(i=0;i<arr1.length;i++){   var status = 0;   for(j=0;j<arr2.length;j++){     if(arr1[i]==arr2[j]){     status = 1;     break;   }}   if(status == 0){  arr2.push(arr1[i]);  }}for(var x in arr2){    document.write(arr2[x]+"<br>");  }</script>

<script type="text/javascript">var arr = [3.14,10,4,"hello"];新定义数组元素var tj = "hello";布尔型判断var cf = true;for(var i =0;i<arr.length;i++){  if(tj == arr[i]){    cf = false;    break;  }}if(cf){  arr.push(tj);　　for(var i in arr){       document.write(arr[i]+"<br>");      } }else{  alert("有重复值");}</script>