Js shield direction keys, compatible with IE and firefox

I would like to share with you how to use js to shield users from pressing the direction keys (compatible with IE and firefox )! Add the following code to the head and body areas of the source code.

Document. onkeydown = function (e) {e = e | event; // mask the left direction key if (e. keyCode = 37) {alert ('Do not move to the left direction key! '); Return false;} // specifies the direction key for blocking the upward direction. if (e. keyCode = 38) {alert ('prohibit the direction key for upward direction! '); Return false;} // mask the right direction key if (e. keyCode = 39) {alert ('prohibit the right direction key! '); Return false;} // mask the downward direction key if (e. keyCode = 40) {alert ('prohibit downward direction keys! '); Return false ;}}

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