phantomjs - 将变量传递到page.evaluate-PhantomJS

Question

是否可以在page.evaluate中传递变量？

function myFunction(webpage, arg1, arg2){

var page = require('webpage').create();

page.viewportSize = { width: 1920, height: 1080 };

page.open(webpage, function (status){

    if (status == 'success') {

            page.includeJs("http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js", function(){

                page.evaluate(function(){

                    arg = arg1 + arg2;
                    console.log(arg);

                });

            });

    } 

    else { phantom.exit(); }

});

}

我尝试了几种在Internet上找到的方法，但实际上没有什么方法无法获得其变量。

预先感谢您的帮助 :)

Answer 1

像往常一样，在evaluate函数的documentation中明确说明了答案:

As of PhantomJS 1.6, JSON-serializable arguments can be passed to the function. In the following example, the text value of a DOM element is extracted. The following example achieves the same end goal as the previous example but the element is chosen based on a selector which is passed to the evaluate call:

以下示例演示了用法:

var title = page.evaluate(function(s) {
    return document.querySelector(s).innerText;
}, 'title');
console.log(title);