使用JavaScript在文本框中的Enter键上触发按钮单击

在jQuery中，以下将起作用：

$("#id_of_textbox").keyup(function(event) {    if (event.keyCode === 13) {        $("#id_of_button").click();    }});$("#pw").keyup(function(event) {    if (event.keyCode === 13) {        $("#myButton").click();    }});$("#myButton").click(function() {  alert("Button pre executed.");});<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>Username:<input id="username" type="text"><br>Password:&nbsp;<input id="pw" type="password"><br><button id="myButton">Submit</button>

或在纯Javascript中，以下方法将起作用：

document.getElementById("id_of_textbox")    .addEventListener("keyup", function(event) {    event.preventDefault();    if (event.keyCode === 13) {        document.getElementById("id_of_button").click();    }});document.getElementById("pw")    .addEventListener("keyup", function(event) {    event.preventDefault();    if (event.keyCode === 13) {        document.getElementById("myButton").click();    }});function buttonCode(){  alert("Button pre executed.");}<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>Username:<input id="username" type="text"><br>Password:&nbsp;<input id="pw" type="password"><br><button id="myButton" onclick="buttonCode()">Submit</button>