javascript笔记03：易犯错的比较运算

1.比较两个值是否相等的常见运算：

""   == ""                          //false
    == ""                            //true
    == ""                          //true
false == "false"                  //false
false == ""                        //false
false   == undefined           //false
false  == null                      //false
null == undefined              //false
"\t\r\n"   ==                     //false

2.比较两个值是否全等的常见运算

""   === ""                          //false
    === ""                            //false
    === ""                          //false
false === "false"                  //false
false === ""                       //false
false   === undefined           //false
false  === null                      //false
null === undefined              //false
"\t\r\n"   ===                     //false

3.无穷大的比较

Infinity>                   //true
Infinity>"abc"              //false
Infinity<"abc"             //false
Infinity=="abc"           //false
Infinity==NaN            //false