使用jQuery作为选择器，使用JavaScript，是否可能？

Question

var helper, kitti, amount;
if (i == 0) { 
    helper = "#k" + ids+ " .contain";
}
else {
    helper = "#k" + ids + " .d" + i;
}    
kitti = "$(" + helper + ").get(0)";
amount = (MouseX-kitti.width / 2) * layer[i - 1] * 2;
kitti.style.transform = "rotateY(" + amount * 50 + "deg)";
kitti.style.left = amount + "px";

This part of my code doesn't seem to work but. I bet I did something wrong selecting it? I've read a couple of articles and I came to this conclusion. But it does not work, can you explain me why? How can I select classes with jQuery and after that continue with plain Javascript?

Answer 1

You've made some simple syntax errors here. I personally don't care for the style in which you're written your code, but I will do my best to suggest what the fix might be.

In the second line, you write kitti = "$(" + helper + ").get(0)" . The problem here is that $ is a function defined in the jQuery library and you are treating it as a string.

The result here will be to assign a string value to the variable kitti . You also appear to be using an undefined variable ids in line 1. The correct syntax would be something like this:

var kitti = $(helper).get(0);

I don't want to be overbearing, but from the syntax of the code in your question, you might benefit from reading a book on good JavaScript such as "JavaScript: The Good Parts", by Douglas Crockford. There is also lots of good information available for free on his web site.