通过: http: //newspaint.wordpress.com/2013/04/25/getting-to-the-bottom-of-why-a-phantomjs-page-load-fails/
创建page
变量后,但在调用之前page.open()
添加以下代码:
page.onResourceError = function(resourceError) {
page.reason = resourceError.errorString;
page.reason_url = resourceError.url;
};
page.open()
现在您可以在回调中打印出问题的原因,例如:
var page = require('webpage').create();
page.onResourceError = function(resourceError) {
page.reason = resourceError.errorString;
page.reason_url = resourceError.url;
};
page.open(
"http://www.nosuchdomain/",
function (status) {
if ( status !== 'success' ) {
console.log(
"Error opening url \"" + page.reason_url
+ "\": " + page.reason
);
phantom.exit( 1 );
} else {
console.log( "Successful page open!" );
phantom.exit( 0 );
}
}
);
调试功能
如果您进一步阅读博客,他会添加更多建议的事件处理程序。我将它们改编成一个函数,您可以使用该函数将事件处理程序注入您的页面对象(而不是在您的主代码中定义它们)
// this method injects some debugging event handlers
// into a PhantomJS page object.
// usage:
// var page = require('webpage').create();
// var system = require('system');
// addDebugEvents(page,system);
function addDebugEvents(page, system) {
page.onResourceError = function (resourceError) {
page.reason = resourceError.errorString;
page.reason_url = resourceError.url;
};
page.onResourceRequested = function (request) {
system.stderr.writeLine('= onResourceRequested()');
system.stderr.writeLine(' request: ' + JSON.stringify(request, undefined, 4));
};
page.onResourceReceived = function (response) {
system.stderr.writeLine('= onResourceReceived()');
system.stderr.writeLine(' id: ' + response.id + ', stage: "' + response.stage + '", response: ' + JSON.stringify(response));
};
page.onLoadStarted = function () {
system.stderr.writeLine('= onLoadStarted()');
var currentUrl = page.evaluate(function () {
return window.location.href;
});
system.stderr.writeLine(' leaving url: ' + currentUrl);
};
page.onLoadFinished = function (status) {
system.stderr.writeLine('= onLoadFinished()');
system.stderr.writeLine(' status: ' + status);
};
page.onNavigationRequested = function (url, type, willNavigate, main) {
system.stderr.writeLine('= onNavigationRequested');
system.stderr.writeLine(' destination_url: ' + url);
system.stderr.writeLine(' type (cause): ' + type);
system.stderr.writeLine(' will navigate: ' + willNavigate);
system.stderr.writeLine(' from page\'s main frame: ' + main);
};
page.onResourceError = function (resourceError) {
system.stderr.writeLine('= onResourceError()');
system.stderr.writeLine(' - unable to load url: "' + resourceError.url + '"');
system.stderr.writeLine(' - error code: ' + resourceError.errorCode + ', description: ' + resourceError.errorString);
};
page.onError = function (msg, trace) {
system.stderr.writeLine('= onError()');
var msgStack = [' ERROR: ' + msg];
if (trace) {
msgStack.push(' TRACE:');
trace.forEach(function (t) {
msgStack.push(' -> ' + t.file + ': ' + t.line + (t.function ? ' (in function "' + t.function + '")' : ''));
});
}
system.stderr.writeLine(msgStack.join('\n'));
};
}