Javascript controls margin

Javascript controls margin-top, margin-left, margin-right...

Never do this.

Document. getelementbyid ("div1"). style. Margin-Top = "30px"; // This is incorrect.

Document. getelementbyid ("div1"). style. margintop = "30px"; // This is incorrect. The top T is lowercase.

Correct: margintop = "30px ";

There are also problems if you use document. getelementbyid ("div1"). style. Margin = "30px,

It cannot be set successfully at the bottom. For some reason, you must set top, right, left, and bottom one by one.

If you set margin = "30px" directly, it means that the four weeks are all 30.