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[英]How to change between 2 background colors using JavaScript with one button
[英]How to switch between two different colors with one button using javascript
我尝试使用JavaScript单击事件侦听器时尝试在两种颜色之间切换。 当我触发click
事件时,它将颜色更改为黑色。 当我再次单击它时,我希望它改回到默认值,即白色。 我认为涉及if语句,但是我不确定在这种情况下逻辑将如何工作。
<!DOCTYPE html>
<html>
<head>
<title>Light Switch</title>
<link rel="stylesheet" href="light.css" />
</head>
<body id="body">
<button id="submit">Submit
<label id="switch">
<input type="checkbox" checked>
<span class="slider"></span>
</label>
</button>
<script src="light.js"></script>
</body>
</html>
function start() {
var submit = document.getElementById("submit");
submit.addEventListener("click", toggle);
};
function toggle() {
var color = document.getElementById("body");
color.style.backgroundColor = "black";
};
start();
您可以在该元素的classList
上使用toggle
功能。 添加一个类并切换它。
function start() { var submit = document.getElementById("submit"); submit.addEventListener("click", toggle); }; function toggle() { var color = document.getElementById("body"); color.classList.toggle('black'); }; start();
.black { background-color: black; }
<body id="body"> <button id="submit">Submit <label id="switch"> <input type="checkbox" checked> <span class="slider"></span> </label> </button> </body>
您也可以只检查当前颜色并每次切换。
function start() { var submit = document.getElementById("submit"); submit.addEventListener("click", toggle); }; function toggle() { var color = document.getElementById("body"); var backColor = color.style.backgroundColor; color.style.backgroundColor = backColor === "black" ? "white" : "black"; }; start();
<body id="body"> <button id="submit">Submit <label id="switch"> <input type="checkbox" checked> <span class="slider"></span> </label> </button> </body>
您可以创建CSS类,然后使用classList
属性将其添加/删除到元素中,而无需操纵backgroundColor
。
function start() { var submit = document.getElementById("submit"); submit.addEventListener("click", toggle); }; function toggle() { var color = document.getElementById("body"); color.classList.toggle("black"); }; start();
.black { background-color: black; }
<div id="body"> <button id="submit">Submit <label id="switch"> <input type="checkbox" checked> <span class="slider"></span> </label> </button> </div>
这样做,我认为它对您有用...
var background = document.getElementById(id).style.background;
var btn = addEventListener("click", function (){
if(background = "rgb(255,145,0)"){
document.getElementById(id).style.background = "red";
}
else
{
document.getElementById(id).style.background = "white";
}
});
function start() { var submit = document.getElementById("submit"); submit.addEventListener("click", toggle); }; function toggle() { var color = document.getElementById("body"); if(color.style.backgroundColor==='black') color.style.backgroundColor=''; else color.style.backgroundColor = "black"; }; start();
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