How does javascript determine whether div exists?

Editor to share with you javascript how to judge the existence of div, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to know it!

Judgment method: 1, use the "document.getElementById (" id value ")" statement to obtain the div element object according to the specified id value; 2, use the if statement to judge whether div exists, and the syntax "if (div element object) {/ / element exists} else {/ / element does not exist}".

The operating environment of this tutorial: windows7 system, javascript1.8.5 version, Dell G3 computer.

Js determines whether the div element exists.

When the native js getElementById () and getElementsByTagName () methods manipulate the element, if the manipulated element does not exist, the browser will throw an error and terminate the running of the code, so in order to avoid this situation, you can use the following code to determine whether the element exists when you are unable to determine whether the element to be manipulated exists.

Implementation code

Div element

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Var div=document.getElementById ("div"); if (div) {/ / the action code that the element exists console.log ("div element exists");} else {/ / the action code console.log ("div element does not exist") that does not exist;}

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