textarea设置maxlength为100，输入到第101个字时不显示，但成功输入，导致提交的数据出现长度限制的错误，代码片段如下：

textareaInput(event,maxlength,propertyName){

if(event.detail.cursor==maxlength){

uni.showToast({

title:'最多只能输入'+maxlength+'个字！',

icon:'none',

duration:2000

})

}else if(event.detail.cursor>maxlength){

uni.showToast({

title:'最多只能输入'+maxlength+'个字！',

icon:'none',

duration:2000

})

console.log('event.detail.cursor:',event.detail.cursor);

console.log('event.detail.value:',event.detail.value);

console.log('this.addForm[propertyName]:',this.addForm[propertyName]);

// this.addForm[propertyName]=this.addForm[propertyName].substring(0,maxlength)

// this.$set(event.detail,'value',event.detail.value.substring(0,maxlength))

}

},

测试结果如图：