1. HTML爱心代码：
```
<span style="color: red; font-size: 50px;">♥</span>
```
2. CSS爱心代码：
```
.heart {
height: 50px;
width: 50px;
background-color: red;
position: relative;
transform: rotate(45deg);
margin-left: 20px;
}
.heart::before, .heart::after {
content: "";
height: 50px;
width: 50px;
background-color: red;
position: absolute;
}
.heart::before {
top: -25px;
border-radius: 25px 25px 0 0;
}
.heart::after {
left: -25px;
border-radius: 25px 0 0 25px;
}
```
3. JavaScript爱心代码：
```
console.log("\
╭┳╮ \n\
│ │ \n\
│ └─╮ \n\
╰───┐ \n\
│ \n\
╰┬╯")
```
