JavaScrip实现PHP print_r的数功能（三种方法）

方法一
复制代码 代码如下:
function print_r(theObj) {
    var retStr = '';
    if (typeof theObj == 'object') {
        retStr += '';
        for (var p in theObj) {
            if (typeof theObj[p] == 'object') {
                retStr += '['+p+'] => ' + typeof(theObj) + '';
                retStr += '' + print_r(theObj[p]) + '';
            } else {
                retStr += '['+p+'] => ' + theObj[p] + '';
            }
        }
        retStr += '';
    }
    return retStr;
}

方法二
复制代码 代码如下:
$(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));
 });
});

方法三
复制代码 代码如下:
print_r:function(theObj) {
 var retStr = '';
 if (typeof theObj == 'object'||typeof theObj == 'array') {
  retStr += '';
  for (var p in theObj) {
   if (typeof theObj[p] == 'object' || typeof theObj[p] == 'array') {
    retStr += '['+p+'] => ' + typeof(theObj) + '';
    retStr += '' + XFUPLOAD.Tools.print_r(theObj[p]) + '';
   } else {
    retStr += '['+p+'] => ' + theObj[p] + '';
   }
  }
  retStr += '';
 }
 $("body").append(retStr);
}