JavaScript implements the instance code of real-time update system time

1. Js code

 function getTime(){ 
    str = "Current system time:" 
    var p = ("sy_time"); 
    time = new Date(); 
    year = (); 
    month = () + 1; 
    day = (); 
    hour = (); 
    minutes = (); 
    seconds = (); 
    str = str + year +"-"+ month +"-"+ day + " " +hour+":"+minutes+":"+seconds; 
     = str; 
    setTimeout(getTime,1000); 
  } 
   = function(){ 
    getTime(); 
  }

2. Front-end code

&lt;!-- Page call code --&gt;
&lt;p id = "sy_time"&gt;&lt;/p&gt;

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