How to visit a page several times in a row with PhantomJS?

问题

Is it possible to open page, do my things and close it. And after a timeout visit it once again to see the content changes (page has many js functions). Trying to open the page twice in a row makes PhantomJS behave unpredictable. What is the solution then?

回答1:

Most the execution in PhantomJS is asynchronous, so you have to open a page only after the first page load was completed:

page.open(url, function(){
    setTimeout(function(){
        // do something
        page.open(url, function(){
            setTimeout(function(){
                // do something
                phantom.exit();
            }, 5000); // 5 seconds
        });
    }, 5000); // 5 seconds
});

or even better using recursion:

var i = 0;
function run(){
    if (i > 100) { // stop execution at some point
        phantom.exit();
    }
    page.open(url, function(){
        // do what you have to do
        setTimeout(run, 5000); // run again in 5 seconds
    });
}
run();

来源：https://stackoverflow.com/questions/28525123/how-to-visit-a-page-several-times-in-a-row-with-phantomjs