本文介绍了Javascript null或空字符串不起作用的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尝试测试我的字符串为空或空,但是它不起作用。
I am trying to test that my string is null or empty, however it does not work.
我的代码:
var veri = {
YeniMusteriEkleTextBox: $('#MyTextbox').val(),
};
if (veri.YeniMusteriEkleTextBox === "" ||
veri.YeniMusteriEkleTextBox == '' ||
veri.YeniMusteriEkleTextBox.length == 0 ||
veri.YeniMusteriEkleTextBox == null) {
alert("Customer Name can not be empty!!!");
}
如何检查YeniMusteriEkleTextBox是空还是空?
How can ı check YeniMusteriEkleTextBox is null or empty ?
推荐答案
我会用的!运算符测试它是否为空,未定义等。
I would use the ! operator to test if it is empty, undefined etc.
if (!veri.YeniMusteriEkleTextBox) {
alert("Customer Name can not be empty!!!");
}
此外,您不需要在 YeniMusteriEkleTextBox之后使用逗号: $('#MyTextbox')。val(),
同样测试可能未定义的对象的长度会引发错误因为长度不是0,所以它将是未定义的。
Also testing for a length on an object that may be undefined will throw an error as the length will not be 0, it will instead be undefined.
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