如何检查 JavaScript 数组中的空字符串?


假设数组中包含非空值和空值,如下所示:-

studentDetails[2] = "Smith";
studentDetails[3] = "";
studentDetails[4] = "UK";
function arrayHasEmptyStrings(studentDetails) {
   for (var index = 0; index < studentDetails.length; index++) {

如需检查空字符串数组,语法如下。设置如下条件进行检查:-

if(yourArrayObjectName[yourCurrentIndexvalue]==””){
   // insert your statement
} else{
   // insert your statement
}

示例

var studentDetails = new Array();
studentDetails[0] = "John";
studentDetails[1] = "";
studentDetails[2] = "Smith";
studentDetails[3] = "";
studentDetails[4] = "UK";
function arrayHasEmptyStrings(studentDetails) {
   for (var index = 0; index < studentDetails.length; index++) {
   if (studentDetails[index] == "")
      console.log("The array has empty strings at the index=" +
      (index));
   else
      console.log("The value is at
      index="+(index)+"="+studentDetails[index]);
   }
}
arrayHasEmptyStrings(studentDetails);

若要运行上述程序,需使用以下命令:-

node fileName.js

此处,我的文件名是 demo210.js。

输出

脚本将生成以下输出:-

PS C:\Users\Amit\javascript-code> node demo210.js
The value is at index=0=John
The array has empty strings at the index=1
The value is at index=2=Smith
The array has empty strings at the index=3
The value is at index=4=UK

更新时间:14-Sep-2020

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