The value of a field can not be null, it's always a string value. ... If you want to check if the element exist at all, you should do that before ... ... <看更多>

But as a judgement call, I think we could stand to have a relatively simple check for values that are null or empty, so I'm looking for feedback on this ... ... <看更多>

IT appears all the way back to jQuery 1.2 where multiple value support ... Can not it be done by putting empty string instead of null here:. ... <看更多>

The JavaScript Tutorial website helps you learn JavaScript programming from scratch quickly and effectively. Recent Tutorials. JavaScript String replaceAll · An ... ... <看更多>

빈문자열임을 확인하고 싶으면 부정(!)을 더해서 false -> true로 만들어주면 된다. bad. if ( string === "" ) ... ... <看更多>