Fastest method to escape HTML tags as HTML entities?

Question

I\'m writing a Chrome extension that involves doing a lot of the following job: sanitizing strings that might contain HTML tags, by converting

Answer 1

Martijn's method as single function with handling " mark (using in javascript) :

function escapeHTML(html) {
    var fn=function(tag) {
        var charsToReplace = {
            '&': '&',
            '<': '<',
            '>': '>',
            '"': '"'
        };
        return charsToReplace[tag] || tag;
    }
    return html.replace(/[&<>"]/g, fn);
}