2018-07-13 js对象没有值

a=""
""
JSON.stringify(a)===''
false
JSON.stringify(a)==='""'
true
JSON.stringify(a)===""
false


function hasNoValue(data){
var judgearray = ["null","",'""',"{}","[]",undefined];
return (judgearray.includes(JSON.stringify(data)) || data == "" || data == undefined || data == null) ? true : false;
}