JavaScript onclick事件使用方法详解

document.getElementById("button").onclick = function() {
 // 设置在此处单击#button时要发生的事件
};

#text-button {
 display: block;
 cursor: pointer;
 width: 160px;
 text-align: center;
 border: 1px solid #232323;
}

document.getElementById("text-button").onclick = function() {
document.getElementById("text").innerHTML = "我点击了！";
};

#square-button {
 width: 80px;
 height: 80px;
 background: #232323;
}
#square-button.blue {
 background: #21759b;
}
JavaScript代码
 
document.getElementById("square-button").onclick = function() {
 this.classList.toggle("blue");
};

<p>你叫什么名字？</p>
<input type="text" id="name">
<button type="button" id="form-button">输入</button>
<div id="form-text"></div>

:focus {
 outline: 1px solid #666;
}
input[type="text"] {
 margin: 0 0 15px;
 padding: 8px 10px;
 border: 1px solid #d0d1d3;
}
button {
 padding: 8px 15px;
 background: #979380;
 color: #fff;
 border: none;
}

document.getElementById("form-button").onclick = function() {
 document.getElementById("form-text").innerHTML = "你好 " + document.getElementById("name").value + " 同学！";
}