How to delete specified elements in an array in javascript

JS deleting the specified element in the array is mainly divided into two steps. First, determine whether the array contains the element, and then delete the specified element through the splice() method.

This article mainly introduces how The method of deleting specified elements in an array through JavaScript language has a certain reference effect. I hope it will be helpful to everyone.

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JavaScript deleting specified elements in an array is generally divided into two In this step, first determine whether the specified element exists in the array, and then delete the element in the array. Next, in this article, I will introduce you to the detailed steps of deleting specified elements in an array using JavaScript.

1. Determine whether the element is in the array

First we need to use JavaScript code to determine whether the element we want to delete is in the array. We can do the following Method to achieve this function

function isInArray(arr,value){
    for(var i = 0; i < arr.length; i++){
        if(value === arr[i]){
            return true;
        }
    }
    return false;
}

Through the above method, you can define a function to determine whether the specified element is in the array. If it is in the array, it will return true, if it is not in the array, it will return false

We can also use the indexOf method to determine whether the specified element is in the array

function IsInArray(arr,val){ 
 
　　var testStr=','+arr.join(",")+","; 
 
　　return testStr.indexOf(","+val+",")!=-1; 
 
} 
  var arr=["sdf","ddd","eds","enm"];
  console.log(IsInArray(arr, "eds"));

There are two points to note when using the indexOf method. One is that the O in the indexOf method must be capitalized, and the other is that this method works in IE browsers. This method does not exist in the array

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##2. Delete the specified element in the array

After finding the index of the element to be deleted, delete the element through the following function method

The realization of this function is mainly realized through the splice() method, which is mainly used for Delete, replace, add elements in the array, etc.

Example:

<script>
function removeArray(arr, val) {
   for(var i = 0; i < arr.length; i++) {
    if(arr[i] == val) {
     arr.splice(i, 1);
     break;
    }
   }
  }
  var arr=["sdf","ddd","eds","enm"];
  removeArray(arr, "eds");
  document.write("<p>删除后的数组：" + arr + "</p>");
</script>

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