了解ES5中是否所有输入框都为空（此ES6的ES5等效于什么？）

Question

Trying to know if all input boxes with an ID starting with 'txtYear_' are empty. I have the following ES6 code, but I would like a ES5 equivalent:

Thanks!

 let allNotEmpty = Array.from($("[id^='txtYear_']")).every(function(e) { return e.value !== ""; }) console.log(allNotEmpty); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input id="txtYear_1" value="1"> <input id="txtYear_2" value="2"> <input id="txtYear_3" value="3"> <input id="txtYear_4" value="4"> <input id="txtYear_5" value="5"> <input id="txtYear_6" value="6"> <input id="txtYear_7" value="7"> 

Answer 1

You can use call to apply Array#every to any array-like object:

var allNotEmpty = Array.prototype.every.call($("[id^='txtYear_']"), function(e) {
  return e.value !== "";    
});

Side note: selectors like $("[id^='txtYear_']") are a good sign you should be using a class instead.

Answer 2

You could use the .each function from jQuery.

 var allNotEmpty = true; $("[id^='txtYear_']").each(function(i, el) { allNotEmpty = allNotEmpty && el.value !== ""; }); console.log(allNotEmpty); 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <input id="txtYear_1" value="1"> <input id="txtYear_2" value="2"> <input id="txtYear_3" value="3"> <input id="txtYear_4" value="4"> <input id="txtYear_5" value="5"> <input id="txtYear_6" value="6"> <input id="txtYear_7" value="7">