How to determine if a message is blank in the frontend of the mini program

How to determine if the message is blank in the frontend of the mini program

Method: You can encapsulate a function that determines whether the object is empty, such as isBlank in the following code.

function isBlank(str){
  if (Object.prototype.toString.call(str) ==='[object Undefined]'){//空
    return true
  } else if (
    Object.prototype.toString.call(str) === '[object String]' || 
    Object.prototype.toString.call(str) === '[object Array]') { //字条串或数组
    return str.length==0?true:false
  } else if (Object.prototype.toString.call(str) === '[object Object]') {
    return JSON.stringify(str)=='{}'?true:false
  }else{
    return true
  }
}

Use isBlank to judge whether the message is empty:

if(isBlank(message)){
    console.log('消息为空')
}else{
    console.log('消息：' + message)
}

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