Help bosses! What is wrong in the figure, why is there unll firstElementChild

CodePudding user response:

This error is said is not firstElementChild null
This error is that the null values, visited firstElementChild attribute
States that the value of the element is null
Element is the element without success

CodePudding user response:

reference 1/f, the sky wave response:

this error is said is not firstElementChild null
This error is that the null values, visited firstElementChild attribute
States that the value of the element is null
Element is the element without success

but I added after the function of the console, log (getFirstElementChild (my $(" uu "))); Uu is ul ID, this element is not to the assignment yet, how can this happen

CodePudding user response:

reference 1/f, the sky wave response:

this error is said is not firstElementChild null
This error is that the null values, visited firstElementChild attribute
States that the value of the element is null
Element is the element without success

I see, I didn't add ul id

CodePudding user response:

reference 1/f, the sky wave response:

this error is said is not firstElementChild null
This error is that the null values, visited firstElementChild attribute
States that the value of the element is null
Element is the element without success

thank you, English remains to be strengthened