String into, interception, stitching, and an array of commonly used methods, object

Nothing else, consolidate the foundation under ...

String:

String Split split ()

String interception slice ()

Alternatively string replace ()

            var STR = "Test, Entity" ; 
            the console.log ( "string ******* *********" );
             // string split into an array 
            console.log ( "split: ", str.split (", " ));
             // string interception 
            // substr (start index, the number of bits taken), can be taken from the tail, a negative index, end -1 
            // Slice second parameter may be omitted, from the specified location to the final cut 
            the console.log ( "substr1:", str.substr (5,3 )); 
            the console.log ( "substr2:", str.substr (-3,3 )); 
            the console.log ( " slice1: ", str.slice (0,4 )); 
            the console.log ( " slice2: ", str.slice (. 4 )); 
            Console.log("slice3:",str.slice(-6));
             // search for a string index, indexOf is the first time, lastIndexOf last appearance, can not be found or -1 
            // can set the second parameter to start looking at the specified location, indexOf from left to right, lastIndexOf from right to left 
            the console.log ( "the indexOf:", str.indexOf ( "T" )); 
            the console.log ( "the indexOf:", str.indexOf ( "T",. 5 )); 
            the console.log ( "lastIndexOf: ", str.lastIndexOf (" T " )); 
            the console.log ( " lastIndexOf: ", str.lastIndexOf (" T ", 2 ));
             // search string, returns the index, there is no or -1, can use regular 
            the console.log ( "serach1:", str.search ( "Test" )); 
            the console.log ( "serach2:", STR.Search (/ [1-9] / G));
             // string replacement (the "replace", "replace")
            the console.log ( "Replace:", str.replace ( "Entity", "String" ));
             // string concatenation can be connected to a plurality of equivalent strings plus Usage 
            console.log ( "concat:", str .concat ( ", App", ", Web" )); 
            
            var ARR = [ "A", "B", "C" ];
             // array to a string that can be specified spacer 
            console.log ( "join1: " , arr.join ()); 
            the console.log ( " join2: ", arr.join (" - " ));
             // toString logic value to a string 
            the console.log (" toString1: " , arr.toString ()); 
            console.log ( "toString2:", to true .toString());
            
            var obj = {"name":"jiangnan"};
            // JSON string type turn 
            the console.log ( "the stringify:" , the JSON.stringify (obj));
             // parse 
            var objStr = the JSON.stringify (obj); 
            the console.log ( "the parse:", the JSON.parse ( objStr));    

Run as follows:

 

 

 

　　Array:

　　Find element position indexOf ()

　　Delete the last element pop ()

　　Delete first element shift ()

　　Adding new elements push ()

　　Connect the new array concat ()

　　

 

 

 

 

　　Object:

　　Merging objects Object.assign (obj1, obj2, obj3)