A brief discussion on precautions when using the splice function to delete elements in an array

Things to note when using the splice function to delete elements in an array

Delete elements with value c:

<script>
var arr = new Array();
arr[0] = &#39;a&#39;;
arr[1] = &#39;b&#39;;
arr[2] = &#39;c&#39;;
arr[3] = &#39;c&#39;;
arr[4] = &#39;e&#39;;
 
for(var i=0; i<arr.length; i++){
  if(arr[i] == &#39;c&#39;){
    arr.splice(i,1);
    i=i-1;  // 必须对i减去1，否则后面的一个元素会被跳过去
  }
 
}
</script>

Note : If you use for(i in arr), the following element will always be skipped

<script>
 
var arr = new Array();
arr[0] = &#39;a&#39;;
arr[1] = &#39;b&#39;;
arr[2] = &#39;c&#39;;
arr[3] = &#39;c&#39;;
arr[4] = &#39;e&#39;;
 
for(i in arr){
 
  if(arr[i] == &#39;c&#39;){
    arr.splice(i,1);
    i=i-1;  // 这行代码无效，i 的值并不会改变
 
  }
  alert(arr.length);
}
</script>

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