为什么即使有空间也没有发现空间？

Question

如何检查SPACE是否存在？跟随名字只能打印第一个单词。

//  var chip_eid = {
//"firstname": "Rubin Rose",
// }; 
if (/^ *$/.test(chip_eid.firstname)) { // Find the SPACE?
  var res = chip_eid.firstname.split(" "); // take Rubin only
  member_firstname = res[0];
}  
else {
  member_firstname = chip_eid.firstname;
}
console.log(member_firstname); // Printing Rubin Rose instead of Rubin

Answer 1

您不需要检查空格。如果有空格，则分割将为您提供名字在数组中第0位的结果，而当空格不存在时，整个名字字符串将在数组中第0位。

var chip_eid = {
"firstname": "RubinRose",
}; 
if(chip_eid.firstname.includes(" "))
  {var res = chip_eid.firstname.split(" "); 
  member_firstname = res[0];
  }
  else
  member_firstname =chip_eid.firstname ;
 
console.log(member_firstname);

Answer 2

尝试使用'/ \ s /'代替'/ ^ * $ /'

var chip_eid = {
  "firstname": "Rubin Rose",
};
if (/\s/.test(chip_eid.firstname)) { // Find the SPACE?
  var res = chip_eid.firstname.split(" "); // take Rubin only
  member_firstname = res[0];
} else {
  member_firstname = chip_eid.firstname;
}
console.log(member_firstname);