JSON usage

 

var students = new Array() ;
students[0] = "onepiece";
students[1] = "naruto";
students[2] = "bleach";
var json = JSON.stringify(students,switchUpper);
function switchUpper(key, value) {
    return value.toString().toUpperCase();
}
alert(json);

  He can receive arrays, and can have functions to handle

 In addition, there is a third parameter, which is convenient for viewing data during development.

 

JSON.stringify({a:1,b:2,c:3,d:{aa:11,bb:22,cc:33}},null,4);

 The third parameter is the number of indented spaces

 The third parameter can also be used with '\t' My Google Chrome defaults to 4 spaces