JavaScrip实现PHPprint_r的数功能（三种方法）

function print_r(theObj) {
    var retStr = '';
    if (typeof theObj == 'object') {
        retStr += '';
    }
    return retStr;
}

$(document).ready(function(){
 $('#btn').click(function(){
   var jsOnStr= $('#jsonData').val();
   var json = eval('('+jsonStr+')');
   (function(){
  var print_r = function(o, depth) {
    var result = '';
    depth || (depth=1);
    var indent = new Array(4*depth+1).join(' ');
    var indentNext = new Array(4*(depth+1)+1).join(' ');
    var indentNextTwo = new Array(4*(depth+2)+1).join(' ');
    var tmp = '';
    var type = typeof o;
    switch(type) {
   case 'string':
   case 'number':
   case 'boolean':
   case 'undefined':
   case 'function':
     tmp += indent + indentNext + o + "\n";
     break;
   case 'object':
   default:
     for(var key in o) {
    tmp += indentNextTwo + '[' + key + '] = ';
    tmp += print_r(o[key], (depth+1));
     }
    }
    result += type + "\n";
    result += indentNext + '(' + "\n";
    result += tmp;
    result += indentNext + ')' + "\n";
    return result;
  };
  alert(print_r(json));
   }(json));
 });
});

print_r:function(theObj) {
 var retStr = '';
 if (typeof theObj == 'object'||typeof theObj == 'array') {
  retStr += '';
 }
 $("body").append(retStr);
}