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;  // 必須對i減去1，否則后面的一個元素會被跳過去
  }
 
}
</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;  // 這行代碼無效，i 的值并不會改變
 
  }
  alert(arr.length);
}
</script>

The above article briefly talks about using the splice function to Things to note when deleting elements are all the content shared by the editor. I hope it can give you a reference, and I hope you will support the PHP Chinese website.

For more brief discussion on the precautions when using the splice function to delete elements in an array, please pay attention to the PHP Chinese website for related articles!