JavaScript 使用 Velocity.js 的 ES6 错误
JavaScript ES6 error using Velocity.js
我尝试用Velocity.js做一个菜单按钮动画。该代码使用 jQuery 运行良好,但现在我尝试仅使用 JavaScript ES6 来执行此操作,但出现错误。
我的HTML内容是这个:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Hamburger 2</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<hc-hamburger role="button">
<a class="McButton" data="hamburger-menu">
<b></b>
<b></b>
<b></b>
</a>
</hc-hamburger>
<script src="velocity.min.js"></script>
<script src="hamburger.js"></script>
</body>
</html>
还有我的JavaScript内容:
'use strict';
class HCHamburger extends HTMLElement {
get menuButton() {
if (!this._menuButton) {
this._menuButton = this.querySelector("[data=hamburger-menu]");
}
return this._menuButton;
}
get bar() {
if (!this._bar) {
this._bar = this.querySelectorAll('b');
}
return this._bar;
}
attachedCallback() {
this.menuButton.addEventListener('click', _ => {
this.menuButton.classList.toggle("active");
let McBar1 = this.bar[0];
let McBar2 = this.bar[1];
let McBar3 = this.bar[2];
if (this.menuButton.classList.contains("active")) {
McBar1.velocity({ top: "50%" }, {duration: 200, easing: "swing"});
McBar3.velocity({ top: "50%" }, {duration: 200, easing: "swing"})
.velocity({rotateZ:"90deg"}, {duration: 800, delay: 200, easing: [500,20] });
this.menuButton.velocity({rotateZ:"135deg"}, {duration: 800, delay: 200, easing: [500,20] });
} else {
this.menuButton.velocity("reverse");
McBar3.velocity({rotateZ:"0deg"}, {duration: 800, easing: [500,20] })
.velocity({ top: "100%" }, {duration: 200, easing: "swing"});
McBar1.velocity("reverse", {delay: 800});
}
});
}
}
document.registerElement('hc-hamburger', HCHamburger);
当我点击我的按钮时出现这个错误:Uncaught TypeError: McBar1.velocity is not a function
正如我之前所说,这段代码使用 jQuery 和经典选择器:
var McBar1 = $('b:nth-child(1)');
我想我在获取 McBar1 内容时遇到了问题,因为当我记录它时,我只有 <b></b>
而不是整个对象...
我们必须使用 jQuery 来获取选择,querySelector 是不够的。
我尝试用Velocity.js做一个菜单按钮动画。该代码使用 jQuery 运行良好,但现在我尝试仅使用 JavaScript ES6 来执行此操作,但出现错误。
我的HTML内容是这个:
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>Hamburger 2</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<hc-hamburger role="button">
<a class="McButton" data="hamburger-menu">
<b></b>
<b></b>
<b></b>
</a>
</hc-hamburger>
<script src="velocity.min.js"></script>
<script src="hamburger.js"></script>
</body>
</html>
还有我的JavaScript内容:
'use strict';
class HCHamburger extends HTMLElement {
get menuButton() {
if (!this._menuButton) {
this._menuButton = this.querySelector("[data=hamburger-menu]");
}
return this._menuButton;
}
get bar() {
if (!this._bar) {
this._bar = this.querySelectorAll('b');
}
return this._bar;
}
attachedCallback() {
this.menuButton.addEventListener('click', _ => {
this.menuButton.classList.toggle("active");
let McBar1 = this.bar[0];
let McBar2 = this.bar[1];
let McBar3 = this.bar[2];
if (this.menuButton.classList.contains("active")) {
McBar1.velocity({ top: "50%" }, {duration: 200, easing: "swing"});
McBar3.velocity({ top: "50%" }, {duration: 200, easing: "swing"})
.velocity({rotateZ:"90deg"}, {duration: 800, delay: 200, easing: [500,20] });
this.menuButton.velocity({rotateZ:"135deg"}, {duration: 800, delay: 200, easing: [500,20] });
} else {
this.menuButton.velocity("reverse");
McBar3.velocity({rotateZ:"0deg"}, {duration: 800, easing: [500,20] })
.velocity({ top: "100%" }, {duration: 200, easing: "swing"});
McBar1.velocity("reverse", {delay: 800});
}
});
}
}
document.registerElement('hc-hamburger', HCHamburger);
当我点击我的按钮时出现这个错误:Uncaught TypeError: McBar1.velocity is not a function
正如我之前所说,这段代码使用 jQuery 和经典选择器:
var McBar1 = $('b:nth-child(1)');
我想我在获取 McBar1 内容时遇到了问题,因为当我记录它时,我只有 <b></b>
而不是整个对象...
我们必须使用 jQuery 来获取选择,querySelector 是不够的。