in anniuzhi [I] .zz = I, I don"t understand how to bind it to the first picture. What is the purpose of using this? 
in anniuzhi [I] .zz = I, I don"t understand how to bind it to the first picture. What is the purpose of using this?
is actually quite simple. Let me give you an example. Words like this are usually done by binding data-id on an element. In fact, it doesn't matter where the attribute is bound, what matters is how to set the property to make it easier for you to use, not necessarily the same as others.
$('.target-li').on("mouseover",function(){
var $id = $(this).attr("data-id"); //
//$id
doSomething($id);
});Line 117, zz is tied to the button. When the event is triggered, read zz to know how many it is
We know that the for loop is global, because there are many ways to broadcast pictures. Again, I'll use my method to help you interpret it:
olis [0] .className = "current";
//
for(var j=0;j<olis.length;jPP){
//j 10
olis[j].index=j;
olis[j].onclick=function(){
//j
//olis[i]j
for(var i=0;i<olis.length;iPP){
olis[i].className="";//className
ulis[i].style.display="none";//
}
olis[this.index].className="current";//className
//ulis
ulis[this.index].style.display="block";//
count=this.index;//count
console.log(this.index);//this.index
}
}
this should be this part of the content, if you don't use this here, because we are looping to each bound click event, the landlord can try to see the print result at the end of the console.log code. If we assign the subscript of each element to the index attribute of arr [I] before, we can solve the problem caused by the subscript loop through the attribute value.
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