Establecer / borrar el valor de entrada predeterminado | Programar Plus

$('.default-value').each(function() {

       var default_value = this.value;

       $(this).focus(function(){
               if(this.value == default_value) {
                       this.value="";
               }
       });

       $(this).blur(function(){
               if(this.value == '') {
                       this.value = default_value;
               }
       });

});
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