我有一个脚本（使用PhantomJS），用于测试加载网页需要多长时间。我要弄清楚的是如何写将页面加载到.csv文件所花费的时间结果。然后，如果我要重新运行测试，以将另一个结果添加到.csv文件中。

码：

var page = require('webpage').create(),
    system = require('system'),
    t, address;
var pageLoadArray = [];
var csvContents = "";
fs = require('fs');

if (system.args.length === 1) {
    console.log('Usage: loadspeed.js <some URL>');
    phantom.exit(1);
} else {
    t = Date.now();
    address = system.args[1];
    page.open(address, function (status) {
        if (status !== 'success') {
            console.log('FAIL to load the address');
        } 
        else {
            t = Date.now() - t;
            console.log('Page title is ' + page.evaluate(function () {
                return document.title;
            }));

            if(t>7000){
                console.log('Loading time was too long... ' + t + "msec");
                pageLoadArray.push(t);
                console.log(pageLoadArray.length);
                console.log(pageLoadArray[0]);
                //store the time value to the .csv file
                phantom.exit(1);
            }
            else{
                console.log('Loading time ' + t + ' msec');
                pageLoadArray.push(t);
                console.log(pageLoadArray.length);
                console.log(pageLoadArray[0]);
                //store the time value to the .csv file
            }
        }
        phantom.exit();
    });

}