<style>
textarea {
height: 500px;
width: 500px;
}
</style>
<body>
<div>
<textarea name="" id="" cols="30" rows="10" onkeyup="MyOnKeyUp()">
</textarea>
<span>还可以输入140字</span>
<script>
var myTextarea = document.getElementsByTagName("textarea")[0];
var mySpan = document.getElementsByTagName("span")[0];
function MyOnKeyUp() {
var len = myTextarea.value.length ;
mySpan.innerHTML= "还可以输入" + (140 - len) + "个字";
}
</script>
</div>
image.png
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