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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