CasperJS / PhantomJS。然后在do / while循环不起作用
问题说明
这样的事情对我来说似乎很合乎逻辑但却引起了wtfcrash的幻象（这就是在日志中调用它但没有提供有用的信息）...
Something like this seemed pretty logical to me but caused phantom to wtfcrash (That's what it's called in the log but doesn't give helpful info)...
do {
casper.then(function() {
var targetFound = false;
links = this.evaluate(getLinks);
var searchResultsAr = [];
for (var link in links) {
searchResultsAr.push(links[link].replace('/url?q=', '').split('&sa=U')[0]);
}
for (var result in searchResultsAr) {
if (searchResultsAr[result] == target) {
targetFound = true;
casper.echo(targetFound);
break;
}
}
if(targetFound)
{
break;
}
});
}while(!targetFound);
正确答案
如果你只想重复，有不同的可能性静态时间你可以使用casper.repeat（） - > 如何为casper.repeat设置一个变量值
There are different possibilies, if you just want to repeat things static times you can use casper.repeat() -> how to have a variable value for casper.repeat
如果你想用multipe做一段时间然后在内部和断点你仍然需要使用递归据我所知，功能。下面是一个例子：
If you want to do a while with multipe then's inside and a break point you still have to use a recursive function as far as i know. Here is an example:
...
casper.then(function() {
loopValidConf.call(this, 0, 15);
});
casper.then(function() {
casper.test.assert(exists, 'true after 15 tries!')
});
function loopValidConf(index, numTimes) {
if (exists === true || index >= numTimes) {
return;
}
casper.then(function() {
casper.reload(function() {
casper.echo("reset values");
});
casper.then(function() {
// set some values here
});
casper.then(function() {
casper.waitForSelector(".selector")
});
casper.then(function() {
if (casper.exists('.targetSelector')) {
exists = true;
casper.echo('targetSelector exists!');
} else {
casper.echo('targetSelector doesnt exists, try it once more!');
}
});
});
casper.then(function() {
loopValidConf.call(this, index 1, numTimes);
});
}
...
这仍然不是最佳的（可能导致记忆问题），但它的工作原理。 :)
This is still not the optimum (could cause memory problems), but it works. :)
这篇好文章是转载于：学新通技术网
