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<script>

//要返回其枚举自身属性的对象。

//一个表示给定对象的所有可枚举属性的字符串数组

//var jss={“password”:[“Please input your Password!”]} ;

var jss={“userName”:[“Please input your username!”],”password”:[“Please input your Password!”]}

var vs=jss[“password”]

console.log(vs);

var t= Object.keys(jss).some(field => jss[field]);

console.log(t); //true;

var jss={} ;

var t= Object.keys(jss).some(field => jss[field]);

console.log(t); //false;

</script>