你可以解釋下面的代碼

Question

這是我的代碼..但我無法理解這段代碼。 plz幫助我

$('.maxlength') 

    .after("<span></span>") 

    .next() 

    .hide() 

    .end() 

    .keypress(function(e) { 

     var current = $(this).val().length; 

     if (current >= 130) { 

      if (e.which != 0 && e.which != 8) { 

       e.preventDefault(); 

      } 

     } 

     $(this).next().show().text(130 - current); 

    }); 

Answer 1

$('.maxlength') // select all items with class 'maxlength' 

.after("<span></span>") // insert a span after 

.next() // move to the span 

.hide() // hide the span 

.end() // go back to originally selected element 

.keypress(function(e) { // add a keypress event handler function 

    var current = $(this).val().length; // get the length of the input value (a string) 

    if (current >= 130) { //if it's long 

     if (e.which != 0 && e.which != 8) { // and if certain keys weren't pressed (delete?) 

      e.preventDefault(); // don't do what those keys would normally do - i.e. ignore the keypress 

     } 

    } 

    $(this).next().show().text(130 - current); // show the remaining chars in the newly added span 

}); 

...所以基本上這個代碼使文本區域有130個字符的限制，並顯示您所允許多少打字。