Why does this if always return true?
This question already has an answer here:
Because $(".deatils.dailyPrice:contains($)")
is an object and not null objects are always evaluated as true
in if
tests.
From the MDN :
Any value that is not undefined, null, 0, NaN, or the empty string (""), and any object, including a Boolean object whose value is false, evaluates to true when passed to a conditional statement
You probably want
if ($(".deatils.dailyPrice:contains($)").length) {
The jQuery function constructs a jQuery object. Objects are always considered true in a truthiness evaluation such as if
.
Try this
if( $(".deatils.dailyPrice:contains($)").length > 0 )
链接地址: http://www.djcxy.com/p/14686.html
上一篇: 如何检查一个div是否存在jquery,以及它是否无效
下一篇: 为什么如果总是返回true?