phantomjs-无法单击“表单”按钮



我无法使用phantomjs单击按钮。填充文本框非常有效。我想使用纯JS(无jQuery)。想法?

var page = require('webpage').create();
page.open('https://www.somepage.com/login', function(status) {
console.log(">page loaded");
page.render('page.png');
page.evaluate(function () {
    var username = "";
    var password = "";
    document.getElementById('login-input').value = username; //works
    document.getElementById('passwd').value = password; //works
    document.getElementsByName('login_button').click(); //this doesn't click the button
});
console.log(">form submitted");
page.render('page1.png');
phantom.exit();
});

您必须触发函数,以遵循以下单击函数之后的代码x.click();

var x = document.getElementById("btn");
document.getElementById("btn").addEventListener('click', function() {
  console.log("Clicked !!");
})
x.click();
<button id="btn">Click</button>

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