Cheat Sheet

by Ray Sun — on

NPM

  1. mirror repository
  • npm –key value
    • npm –registry https://registry.npm.taobao.org info underscore
  • config
    • npm config set registry https://registry.npm.taobao.org
    • npm info underscore

The rule of thumb

  • 1.Three ways to check empty

              1. if   (typeOf(x)   ==   "undefined")
          2. if   (typeOf(x)   !=   "object")
          3. if(!x)

Check Browsers

              function myBrowser(){
                  var userAgent = navigator.userAgent;
                  var isOpera = userAgent.indexOf("Opera") > -1; //Opera
                  var isIE = userAgent.indexOf("compatible") > -1 && userAgent.indexOf("MSIE") > -1 && !isOpera; //IE
                  var isFF = userAgent.indexOf("Firefox") > -1; //Firefox
                  var isSafari = userAgent.indexOf("Safari") > -1; //Safari
                  if (isIE) {
                      var IE5 = IE55 = IE6 = IE7 = IE8 = false;
                      var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
                      reIE.test(userAgent);
                      var fIEVersion = parseFloat(RegExp["$1"]);
                      IE55 = fIEVersion == 5.5;
                      IE6 = fIEVersion == 6.0;
                      IE7 = fIEVersion == 7.0;
                      IE8 = fIEVersion == 8.0;
                      if (IE55) {
                          return "IE55";
                      }
                      if (IE6) {
                          return "IE6";
                      }
                      if (IE7) {
                          return "IE7";
                      }
                      if (IE8) {
                          return "IE8";
                      }
                  }//isIE end
                  if (isFF) {
                      return "FF";
                  }
                  if (isOpera) {
                      return "Opera";
                  }
              }