微博输入小demo
枫2019-05-04 10:26:16319<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>微博输入</title>
<style>
.box{width: 600px;height: 160px;border: 10px solid pink;margin: 0 auto;padding: 10px}
#te{width: 600px;height: 100px;border: 1px solid #ccc}
</style>
<script type="text/javascript">
var sp,te,m
window.onload=function () {
sp=document.getElementById('sp');
te=document.getElementById('te');
bt=document.getElementById('bt');
te.onkeyup=function aa() {
m=180-te.value.length;
if(m>=0){
sp.style.color="#888";
}else {
sp.style.color='red';
}
sp.innerHTML=m; //字体颜色变化
}
//button的设置
bt.onclick=function () {
if(m==180){
alert('请输入你的内容');
te.focus();
}else if(m<0){
alert('超出字数限制');
te.focus();
}else{
alert('发布成功')
}
}
aa() //aa函数的调用
}
</script>
</head>
<body>
<div class="box">
<div class="box1">还可以输入<span id="sp"></span>字</div>
<textarea id="te"></textarea>
<button id="bt">发布</button>
</div>
</body>
</html>