How to load third-party javascript tag asynchronously which has [removed]

Question

We give out a piece of javascript tags such as which site owners put on their site like http://exa

Answer 1

You can support script injection the correct way by intercepting calls to document.write in this way:

document.writeText = document.write;

document.write = function(parameter) {
    if (!parameter) return; 
    var scriptPattern = /<script.*?src=['|"](.*?)['|"]/;
    if (scriptPattern.test(parameter)) {
        var srcAttribute = scriptPattern.exec(parameter)[1];
        var script = document.createElement('script');
        script.src = srcAttribute;
        document.head.appendChild(script); 
    }
    else {
        document.writeText(parameter);
    }   
};

Obviously this can be condensed down a bit further, but the variable names are included for clarity.

Source