js中Date和Infinity

 const log = console.log;

    
  
    
 log("begin ", Date.now() / 1000);
    
 setTimeout(function() {
    
     log("last ", Math.floor(Date.now() / 1000));
    
 }, 3000);
    
  
    
 let d = new Date(1999, 11, 8, 14, 30, 44, 901);
    
 log("d = ", d, ",    ", d.getTime() / 1000);
    
 log("Date.now() = ", Date.now());
    
 log(2 / 0);
    
 log("Infinity === Infinity  ", Infinity === Infinity);
    
 log("Infinity == Infinity  ", Infinity == Infinity);
    
 log("Number.isFinite('xds')  ", Number.isFinite('xds'))
    
 log("Number.isFinite('8x')