Uncaught Typeerror:cannot Read Property ' style '

JS in the browser reported the following error (in Chrome): uncaught typeerror:cannot Read Property ' style ' of NULL

browser if the following error is reported (in Chrome):uncaught typeerror: cannot read  property  ' style '  of null   what does this error mean? (You need to master the processing of JS common errors and common English error meaning)  

 

The object that calls the Style property is empty,

For example, if you want to use document.getElementById ("Text1"), there is no element to get, the best way is

var pa = document.body.querySelector (' #pa ') gets the element and then

pa.style.display= "Block";

Uncaught Typeerror:cannot Read Property ' style '