问当更改在刮取Google搜索时设置特定的用户代理字符串时，CasperJS返回不同的结果

EN

var links = [];
var casper = require('casper').create({
    // verbose: true, 
    // logLevel: "debug" 
    // pageSettings: {
    //  userAgent: 'Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5'
    // }
});

function getLinks() {
    var links = document.querySelectorAll('h3.r a');
    return Array.prototype.map.call(links, function(e) {
        return e.innerText;
    });
}

casper.start('https://www.google.com/#safe=off&q=Apples', function() {
    // search for 'casperjs' from google form
    this.fill('form[action="/search"]', { q: 'casperjs' }, true);
    casper.capture('screenshot/googleresults1.png');

});

casper.then(function() {
    // aggregate results for the 'casperjs' search
    links = this.evaluate(getLinks);
    casper.capture('screenshot/googleresults2.png');
    // now search for 'phantomjs' by filling the form again
    this.fill('form[action="/search"]', { q: 'phantomjs' }, true);

});

casper.then(function() {
    // aggregate results for the 'phantomjs' search
    links = links.concat(this.evaluate(getLinks));
});

casper.run(function() {
    // echo results in some pretty fashion
    this.echo(links.length + ' links found:');
    casper.capture('screenshot/googleresults3.png');
    this.echo(' - ' + links.join('\n - ')).exit();
});