Question

我已将以下代码放入我的网站，以检查我所在的浏览器：

function myFunction() {
    if ((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1) {
        document.write('Opera');
    } else if (navigator.userAgent.indexOf("Chrome") != -1) {
        document.write('Google Chrome');
    } else if (navigator.userAgent.indexOf("Safari") != -1) {
        document.write('Safari');
    } else if (navigator.userAgent.indexOf("Firefox") != -1) {
        document.write('Firefox');
    } else if ((navigator.userAgent.indexOf("MSIE") != -1) || (!!document.documentMode == true)) { //IF IE > 10
        document.write('IE (Internet Explorer)');
    } else {
        document.write('Browser Undefined');
    }
}
document.write(myFunction());

代码工作正常。当我在谷歌浏览器中时，它显示的是名称，但在浏览器名称旁边显示“未定义”一词。

Answer 1

＆＃13;

function myFunction() {
    if ((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1) {
        return 'Opera'
    } else if (navigator.userAgent.indexOf("Chrome") != -1) {
        return 'chome'
    } else if (navigator.userAgent.indexOf("Safari") != -1) {
         return 'Safar'
    } else if (navigator.userAgent.indexOf("Firefox") != -1) {
       return 'Foxy'
    } else if ((navigator.userAgent.indexOf("MSIE") != -1) || (!!document.documentMode == true)) { //IF IE > 10
        return 'MIS'
    } else {
       return document.write('Browser Undefined');
    }
}
document.write(myFunction());

＆＃13;

Answer 2

您可以编写类似

的代码

function myFunction() {
  var browser = "";
  if ((navigator.userAgent.indexOf("Opera") || navigator.userAgent.indexOf('OPR')) != -1) {
    browser = 'Opera'
  } else if (navigator.userAgent.indexOf("Chrome") != -1) {
    browser = 'chrome'
  } else if (navigator.userAgent.indexOf("Safari") != -1) {
    browser = 'Safar'
  } else if (navigator.userAgent.indexOf("Firefox") != -1) {
    browser = 'Foxy'
  } else if ((navigator.userAgent.indexOf("MSIE") != -1) || (!!document.documentMode == true)) { //IF IE > 10
    browser = 'MIS'
  } else {
    browser = 'Browser Undefined';
  }
  return browser;
}
document.write(myFunction());

JavaScript浏览器检测有效但后面显示“未定义”

2 个答案: