JavaScript TypeError: Cannot read property 'style' of null

Question

I have JavaScript code and below line has problem.

if ((hr==20)) document.write(\"Good Night\"); document.getElementById(\'Night).style.display=\'\'
<         


        

Answer 1

I met the same problem, the situation is I need to download flash game by embed tag and H5 game by iframe, I need a loading box there, when the flash or H5 download done, let the loading box display none. well, the flash one work well but when things go to iframe, I cannot find the property 'style' of null , so I add a clock to it , and it works

let clock = setInterval(() => {
        clearInterval(clock)
        clock = null
        document.getElementById('loading-box').style.display = 'none'
    }, 200)