e.pageX = e.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) - (html.clientLeft || 0)
how would this expression evaluate?
e.pageX = e.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) –
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e.pageX = e.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) - (html.clientLeft || 0)
how would this expression evaluate?
You can find a precedence table for Javascript operators on MDN: https://developer.mozilla.org/en/JavaScript/Reference/Operators/Operator_Precedence. It is a great source for Javascript documentation in general.
Anyway,
&&has higher precedence than||soa && b || c || dis equivalent to(((a && b) || c) || d). This is similar to many other language with a C-inspired syntax.