How to Check If an Object Is Empty in JavaScript Use Object.keys Loop Over Object Properties With for…in Use JSON.stringify Use jQuery Use Underscore and Lodash Libraries 1. Use Object.keys Object.keys will return an array, which contains the property names of the object. If the length of...
#Checking empty object with JavaScript The plain vanilla way is not as concise. But it does do the job 👍 functionisObjectEmpty(value){return(Object.prototype.toString.call(value)==='[object Object]'&&JSON.stringify(value)==='{}');} ...
log(isEmptyObject(Date.now())); //output: true 2 console.log(isEmptyObject(new RegExp()); //output: false Once again, this method will fail on a null or undefined input. 3. JSON.stringify The JSON.stringify method is used to convert a JavaScript object to a JSON string. So ...
jquery源码部分: isEmptyObject: function( obj ) { var name; for ( name in obj ) { return false; } return true; }, 这个方法就是直接判断是不是空的对象,$('')返回的是一个jquery对象,即使没有这个DOM,还是返回一个jquery对象,是个jquery对象,起码jquery的方法都会有,所以调用这个方法势必返回false ...
function isEmpty(obj) { for (let key in obj) { if (obj.hasOwnProperty(key)) { return false; } } return true; } // 示例同上 优势: 不依赖于额外的方法,适用于所有JavaScript环境。 劣势: 代码相对冗长。 需要使用hasOwnProperty来确保只检查自有属性,避免继承属性的干扰。
<script>functionObjIsEmpty(obj){varisEmpty =true//如果存在任何一个属性,则将isEmpty赋值为falsefor(keyinobj){ isEmpty =false}returnisEmpty }varobj = {}varobj2 = {a:1,b:2}console.log(ObjIsEmpty(obj))//trueconsole.log(ObjIsEmpty(obj2))//false</script> ...
在使用JavaScript的时候,时不时就会遇到判断如何对象Object是否为空,所以汇总了一下,方便查阅,我一般是使用方法二。 js 判断一个 object 对象是否为空,下面汇总了几种判断方法: 方法一: 最常见的思路,for...in...遍历属性,为真则为“非空数组”;否则为“空数组” ...
The JavaScript function above takes in an object as a parameter before checking to see whether it is empty or not. If the object is empty, this function will return a boolean TRUE value. If the object isnot empty, then it will return a FALSE value. ...
For JavaScript objects, there is no built-in .length or .isEmpty method available to check if they are empty. Here are 4 different methods that you can use to make sure that a given object does not have its own properties: Object.entries() Method The Object.entries() method takes an ...
Read this tutorial and find methods of checking whether a JavaScript object is empty or not. Choose the best one for you and get the code immediately.