How to determine whether an attribute exists in jquery

Jquery method to determine whether an attribute exists: 1. Use [attr()] to obtain the attribute and check the type of the value; 2. The hasAttribute method of native js; 3. Filter selection method, the code is [$(this ).is('[name]');].

The operating environment of this tutorial: windows7 system, jquery3.2.1 version, DELL G3 computer.

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##jquery method to determine whether an attribute exists:

jquery can use the

attr() method, is() method, filter() method, and native js's ## to determine the existence of an attribute. #hasAttribute()Method. 1. Use

attr()

to get the attribute and check the value type <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">var attr = $(this).attr(&amp;#39;name&amp;#39;); // 对于一些浏览器，attr是undefined、或者是false if (typeof attr !== typeof undefined &amp;&amp; attr !== false) { alert(&amp;#39;具有该属性&amp;#39;) }</pre><div class="contentsignin">Copy after login</div></div>2. The hasAttribute method of native js

$(this)[0].hasAttribute("name");
jQObject[0].hasAttribute("name");

3. Filter selection Way

$(this).is('[name]');
$(this).filter("[name='choice']");

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