phantomjs-截图
var webpage = require('webpage');
var page = webpage.create();
var url = "https://www.baidu.com/";
page.viewportSize = {width:1920,height:1080}
page.open(url,function(s){
if (s == "success") {
page.render('baidu.jpeg',{format:'jpeg',quality:'100'});
phantom.exit();
};
});