san框架计数的textarea

<template><div style="height: 100%;width:100%;"><div style="border-bottom: 1px solid #e7e7e7"><div style="height:230px;overflow: hidden;"><t-textarea id="cxfssy" value="{= cxfssy =}" maxlength="120"/></div><div align="right"><span>{{zs}}/120</span></div></div></div>
</template>

(function ($manager) {$manager.defineComponents({...initData: function () {return {zs: '120',}},attached: function () {var that = this;$("#cxfssy").on("keyup",function (){var cxfssy = that.data.get("cxfssy");if (cxfssy){that.data.set("zs",120 - cxfssy.length);}})},getCxfssy: function (){return this.data.get("cxfssy");},}})
})($manager);