How do I add slashes to a string in Javascript?

Question

Just a string. Add \\\' to it every time there is a single quote.

Answer 1

if (!String.prototype.hasOwnProperty('addSlashes')) {
    String.prototype.addSlashes = function() {
        return this.replace(/&/g, '&') /* This MUST be the 1st replacement. */
             .replace(/'/g, ''') /* The 4 other predefined entities, required. */
             .replace(/"/g, '"')
             .replace(/\\/g, '\\\\')
             .replace(//g, '>').replace(/\u0000/g, '\\0');
        }
}

Usage: alert(str.addSlashes());

ref: https://stackoverflow.com/a/9756789/3584667