解決了??！我已經(jīng)更改了一點(diǎn)代碼，我認(rèn)為現(xiàn)在更正確了，現(xiàn)在我已將事件對(duì)象用于目標(biāo)模糊的輸入。    var inputHandler = document.getElementsByTagName("input")[0];    var inputListener = document.getElementsByTagName("input")[1];    var msg = document.getElementById("message");    function checkLength(e, minLength){        el = e.target;        if (el.value.length < minLength) {            msg.textContent = "please, introduce at least " + minLength + " characters";            el.style.borderColor = "red";        }        else{            msg.textContent = "";            el.style.borderColor = "green";        }    }    inputHandler.onblur = function(e){checkLength(e, 3);};    inputListener.addEventListener("blur", function(e){checkLength(e, 5);}, false);