CasperJS传递变量进行评估无法使其工作

Question

好吧所以这是我的casperjs功能:

if(casper.exists(ac2)){

    var accountnumber = this.fetchText('div.arabic:nth-child(2) > table:nth-child(1) > tbody:nth-child(1) > tr:nth-child(2) > td:nth-child(2) > a:nth-child(1)');
    var redir = accountnumber.substr(1);

casper.then(function() {

var uel = "https://example.ws/send.html?f=" + redir;
this.thenOpen(uel, function() {
casper.wait(10000, function() {    
    casper.then(function() {
    var accountnumber1 = this.fetchText('div.arabic:nth-child(1) > font:nth-child(1)');
    var acccc = accountnumber1.split(' ');
    system.stdout.writeLine(acccc[3]); // this output a number 
    var amount = acccc[3];
var result = amount * 0.019;
var result2 = result.toFixed(6);
var fresult = amount - result2;
var needed = fresult.toFixed(3);
    system.stdout.writeLine(needed); // this output a number 
    this.evaluate(function() {

    document.getElementById('account').value = '6028';
    document.getElementsByName('data')[0].value = needed; // this just does not work even though i know there a number needed in var needed 

    }); 
    //this.click("input#sbt.button[type='submit']");

casper.wait(10000, function() {
    casper.then(function() {
    this.capture("capture1.jpg");
    var el2 = this.getHTML();
    fs.write('result.html', el2, 'w');
    });
   });
  });});
 });
});

} else { 

this.exit(); 

}

由于某种原因,我无法让变量正确发送到此函数:

    this.evaluate(function() {

    document.getElementById('account').value = '6028';
    document.getElementsByName('data')[0].value = needed; // this just does not work even though i know there a number needed in var needed 

    }); 

任何人都可以帮我解决这个问题,这样数字就可以正常通过来评估功能.

Answer 1

将您的needed变量作为evaluate()派生自PhantomJS的函数的参数传递evaluate().

你混合2个不同的上下文.在页面DOM环境(内部evaluate())中,needed未知,因为evaluate()是沙箱.

我设置var neededCasperContext = needed;向您展示差异,但当然您可以直接传递它.

var neededCasperContext = needed;

this.evaluate(function(neededPageDomContext) {

    document.getElementById('account').value = '6028';
    document.getElementsByName('data')[0].value = neededPageDomContext;
}, neededCasperContext);