Bootstrap文本域textarea怎么设置

Question

如题所述

Answer 1

直接设置下textarea的length即可，之后到达固定的长度就会自动换行：
<textarea style="width: 200px;height: 200px;"></textarea>
<script>
document.getElementsByTagName('textarea')[0].onkeypress = function () {
var value = this.value,
allLine = value.split('\n'),
lastLine = allLine.pop();

if (lastLine.length >= 15) {
lastLine = lastLine.substr(0, 15) + '\n' + lastLine.substr(15);
allLine.push(lastLine)
this.value = allLine.join('\n');
}
};
</script>