JavaScript 没有全局临时变量的唯一ID生成器

Posted 2021-05-19

var uid = (
  function(){
    var id=0; 
    return function(){
      return id++ ;
    };
  } 
)();
//then just say:
alert(uid()); //alert 1
alert(uid()); //alert 2
alert(uid()); //etc.