jQuery - If (“A”左值等于“B”宽度减去“C”宽度)

Question

标题说得很好：

If ( element-A's left value is equal to element-B's width minus element-C's width )

http://jsfiddle.net/UAKXq/1

我做错了什么？

Answer 1

这是正确的

if (parseInt(A.css('left')) == B.width() - C.width()) {

http://jsfiddle.net/UAKXq/14/

Answer 2

用这个

if(parseInt(A.css('left')) == (B.width() - C.width())) 

Answer 3

if( parseInt(A.css('left'),10) === parseInt(B.css('width'), 10) - parseInt(C.css('width'), 10)) { 
    $('body').css({ background: 'red' }); 
}

http://jsfiddle.net/UAKXq/20/