Checking the input if its empty

This question already has an answer here:

How do you check for an empty string in JavaScript? 39 answers

---

检查长度属性以确定它是否为空：

if ($.trim($('#username').val()).length > 0) {
// not empty
}

链接地址: http://www.djcxy.com/p/27522.html

上一篇: 如果输入只有空格

下一篇: 检查输入是否为空