phantomjs基础

机制

阻塞式等待

function block(nSeconds) {
    var now = new Date();
    var exitTime = now.getTime() + nSeconds * 1000;
    console.log('before block: '+ now.getSeconds());
    while (true) {
        now = new Date();
        if (now.getTime() > exitTime) {
            break;
        }
    }
    console.log('after block: '+ now.getSeconds());
 }

传参

page.evaluate(click_button, g_button_index)；
function click_button(button_index) {
    console.log('click_button: index = ' + button_index);
    var btns = document.getElementsByTagName('button');
    console.log('click_button: button count = ' + btns.length);
    if(btns.length > button_index) {
        btns[button_index].click();
    }
    return;
}