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How to determine whether a value exists in a jquery array

藏色散人Original: 2020-12-08 10:34:343050browse

The jquery array method to determine whether a value exists: first create an HTML sample file; then use the "$.inArray("Element (String)", array name)" method to find the specified value in the array, and Just return its index value.

The operating environment of this tutorial: windows7 system, jquery1.10.0 version, Dell G3 computer.

To determine whether an array contains an element, from the principle In other words, it is to traverse the entire array and then determine whether it is equal

Jquery method

You can use the method provided by Jquery: use $.inArray() to judge.

inArray() function is used to find the specified value in the array and return its index value (if not found, return -1)

$.inArray("元素(字符串)",数组名称)

When the element (string) exists , returns the subscript of the element in the array, returns -1 if it does not exist

Example:

<!DOCTYPE>
<html>
<head>
<title>jquery判断值是否存在于数组中</title>
<meta charset="utf-8">
</head>
<body>
<script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script>
//参数第一个为数组，第二个为需要判断是否存在于数组中的值
function isInArray(arr,val){
  var str = ","+arr.join(",")+",";
  if(str.indexOf(","+val+",") != "-1"){
    //该数存在于数组中
    arr.splice($.inArray(val,arr),1);  //把该数从数组中删除
    console.log(arr);
  }else{
    //该数不存在于数组中
    console.log("不存在");
  }
}
var arr = [1,28,60,80,6];
isInArray(arr,28);//存在，删除元素28
isInArray(arr,18);//不存在，提示“不存在”
</script>
</body>
</html>

Rendering:

How to determine whether a value exists in a jquery array

js method

var arr = ["a", "b", "c"];
// js arr.indexOf("c")
var result1 = arr.indexOf("c"); //返回index为2

Custom method

var arr = ["a", "b", "c"];
// 自定义 contains(arr, "c")方法
function contains(arr, obj) {
    //while
    var i = arr.length;
    while(i--) {
        if(arr[i] === obj) {
            return i;
        }
    }
    return -1;
}
var result1 = contains(arr, "c"); //返回index为2

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