I noticed that writing cross-browser compatible code in JavaScript could be a little difficult in some cases. Is using jQuery a guarantee that my JavaScript code works in all browsers?
As you can read on jQuery's page about browser compatibility, it supports all modern browsers including old but widely used browsers like Internet Explorer 7. If you encounter an issue with a browser using jQuery, you should submit a bug report. The beauty with frameworks such as jQuery is their compatibility.
Good luck!
jQuery provides good compatibility among modern browsers. There are, however, no guarantees. No one can offer you that.
来源：https://stackoverflow.com/questions/6384707/is-using-jquery-a-guarantee-for-cross-browser-compatibility