javascript - Jquery add property values to css -

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i'm new jquery. want task on drop-down menu below:

if (scrnwidth <= 761) {         if (display block) {             //defaultly testi has display:none property.             testi = make testi display         }         else{             return false;         }     }

that task not working me. how add css properties?? didn't found errors. here's code:

jquery('.menu_toggler').click(function () {     var scrnwidth = jquery(window).width();     var display = jquery('.mobile_menu_wrapperr');     var testi = jquery('.main_header');     if (scrnwidth <= 761) {         if (display.css("display") === "block") {             testi = testi.css("display" == "none");         }         else{             return false;         }     } });

thanks in advance.

syntax incorrect 

 testi = testi.css("display" == "none");

correct syntax 

 testi = testi.css("display","none");

or

testi.hide();





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