检查jQuery中是否存在Attribute（'id'）-CheckifAttribute('id')ExistsinjQuery

21  

This itself will work:

这本身会起作用:

if($(this).attr("id"))

Check existing jsfiddle on the issue: http://jsfiddle.net/rwaldron/wVqvr/4/

在问题上检查现有的jsfiddle:http://jsfiddle.net/rwaldron/wVqvr/4/

9  

Just try it the old way

试试旧方式

if (this.id) { 
    //do something
}

7  

You can use the is method and the Has Attribute Selector:

您可以使用is方法和Has属性选择器:

if ($(this).is('[id]')) {

}

2  

if ($(this).attr('id')){ alert(id); }

if($(this).attr('id')){alert(id); }

0  

you could also just use the plain js object

你也可以使用普通的js对象

if( this.id !== undefined && this.id.length > 0 ){
 //todo: use id
}

0  

HTML:

​

jQuery:

var id = $('div.hey').attr('id');
if (id) {
    // Have an id.
} else {
    // Don't have an id.
}

A fiddle: http://jsfiddle.net/NEVYT/

小提琴:http://jsfiddle.net/NEVYT/