Override console.log while keeping its functionality available. Also allows for extending it to trace to screen.

gistfile1.txt

((context) => {
    if(context)
        console.trace = (console.log.bind === 'undefined') ? Function.prototype.bind.call(console.log, console, context) : console.log.bind(console, context);
    else
        console.trace = (console.log.bind === 'undefined') ? Function.prototype.bind.call(console.log, console) : console.log.bind(console);
})("Context message:")

console.log('abc', 123, [9,8,7], {x:0, y:'z'})
console.trace('abc', 123, [9,8,7], {x:0, y:'z'})

// Render console.log useless while persisting .trace:
console.log = ()=>{}

// Extend console.log to behave as usual in addition to performing other activities
console.log = (...args) => {
    console.trace(...args); 
    alert(args.join(' '));
}

console.log('abc', 123, [9,8,7], {x:0, y:'z'})
console.trace('abc', 123, [9,8,7], {x:0, y:'z'})