console.log is only available after you have opened the Developer Tools (F12 to toggle it open and closed). Funny thing is that after you’ve opened it, you can close it, then still post to it via console.log calls, and those will be seen when you reopen it. I’m thinking that is a bug of sorts, … Read more
Versions of IE before IE9 don’t have an .indexOf() function for Array, to define the exact spec version, run this before trying to use it: if (!Array.prototype.indexOf) { Array.prototype.indexOf = function(elt /*, from*/) { var len = this.length >>> 0; var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); … Read more
Do it like this… if (!Array.prototype.indexOf) { } As recommended compatibility by MDC. In general, browser detection code is a big no-no.
I wouldn’t do it. Use virtual PCs instead. It might take a little setup, but you’ll thank yourself in the long run. In my experience, you can’t really get them cleanly installed side by side and unless they are standalone installs you can’t really verify that it is 100% true-to-browser rendering. Update: Looks like one … Read more
Try if (!window.console) console = … An undefined variable cannot be referred directly. However, all global variables are attributes of the same name of the global context (window in case of browsers), and accessing an undefined attribute is fine. Or use if (typeof console === ‘undefined’) console = … if you want to avoid the … Read more