今天写了一个表单提交数据,基本代码写完之后,发现不输入内容也可以提交,就是数据库里面也储存了空的记录值,这样就会浪费储存空间,于是想到写一段js代码判断空值,写完判空的js函数之后就在触发的事件属性调了改函数,果不其然是弹窗了,但是当我点击对话框的确定按钮的时候,浏览器还继续向下执行,于是就纳闷了,所以去百度一下说是要在调用的地方加上return
js如何要让alert之后点确定不继续向下执行,就要在调用函数的前面加上return
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