PhantomJS的问题:phantom.args似乎不起作用

时间:2012-02-24 21:14:04

标签: c# javascript cmd screen-scraping phantomjs

这是我的PhantomJS测试项目,我在cmd.exe中输入(例如):

>phantomjs.exe abacus.js 1111 222
name: 1111
pass: 222
load started
load finished
jQuery loaded
console> name:
console> pass: undefined
step 0
step 1
done

Abacus.js:

var name, pass;
if (phantom.args.length !== 2) {
    console.log('not enough arguments!');
    phantom.exit();
} else {
    name = phantom.args[0];
    pass = phantom.args[1];
}
console.log("name: " + name);  //output: "name: MyUsername"
console.log("pass: " + pass);  //output: "pass: MyPassword"
var stepIndex = 0;
var page = new WebPage();
var loadInProgress = true;
var jQueryLoad = false;
page.onConsoleMessage = function (msg, line, source) {
    console.log('console> ' + msg);
};
page.onAlert = function (msg) {
    console.log('alert> ' + msg);
};
page.onLoadStarted = function () {
    loadInProgress = true;
    console.log("load started");
};
page.onLoadFinished = function () {
    loadInProgress = false;
    console.log("load finished");
    jQueryLoad = page.injectJs("jquery-1.7.1.min.js");
    if (jQueryLoad)
        console.log('jQuery loaded');
};
var interval = setInterval(function () {
    if (jQueryLoad && !loadInProgress && typeof steps[stepIndex] == "function") {
        steps[stepIndex]();
        page.render("step " + stepIndex + ".png");
        console.log("step " + stepIndex++);
    } 
    if (typeof steps[stepIndex] != "function") {
        console.log("done");
        phantom.exit(); 
    } 
}, 1000);
var steps = [
function () {
    page.evaluate(function () {
        console.log("name: " + this.name);  //output: "console> name:"
        console.log("pass: " + this.pass);  //output: "console> pass: undefined"
        var arr = document.frmMain;
        if (arr !== null) {
            arr.elements["username"].value = "MyUsername";  //Only fils in form if it's a string literal
            arr.elements["password"].value = "MyPassword";
        } else {
            console.log("Could not find frmMain");
        }
    });
}, function () {
    page.evaluate(function () {
        document.frmMain.submit();
    });
} ];
page.open("http://www.abacusdatagraphics.com/");
page.viewportSize = { width: 1280, height: 1024 };

为什么phantom.args&名字/通行证突然失去了价值。

我在C#中运行cmd.exe,因为名称和密码时不时地更改并保存在数据库中。这只是一个小测试程序,看看是否可以完成。

(另外,感谢Stack Overflow首先为我提供了大部分代码)

1 个答案:

答案 0 :(得分:1)

@jlafay

我在this中使用的解决方案是这样的:

PhantomJS无法使用变量填充表单,因为page.evaluate无法处理参数,因此在填写表单时,变量(和表单)为空。

所以我将function()视为字符串并传递如下变量:

page.evaluate('function () {' +
    'var theName = ' + name + ';' +
    'var thePass = ' + pass + ';' +
    'console.log(\"name: \" + this.name);' +  //output: "console> name:"
    'console.log(\"pass: \" + this.pass);' +  //output: "console> pass: undefined"
    'var arr = document.frmMain;' +
    'if (arr !== null) {' +
    '    arr.elements["username"].value = theName;' +
    '    arr.elements["password"].value = thePass;' +
    '} else {' +
    '    console.log("Could not find frmMain");' +
    '}' +
'}');

或类似的东西,我不再有代码了。