Javascript Jquery 遍历Json的实现代码

/* 
  author: liulf 
  function: 
  var __db_cpcj=vCpcj; 
  var __db_cp=vCp; 
      var vCp={"cppage":[ 
      {"cpdh":"A01000101","page":"1","ca":"1309-36-0","mc":"硫铁矿","ename":"Pyrite","bm":"黄铁矿"}, 
      {"cpdh":"A01000201","page":"1","ca":"1309-36-0","mc":"硫精砂","ename":"Pyrite concentrate;Sulfur concentrate","bm":""}, 
      {"cpdh":"A01000202","page":"1","ca":"1309-36-0","mc":"硫精矿粉","ename": 
      "Powdered pyrite concentrate;Pyrites concentrate,powder;Sulfur concentrate,powder","bm":"硫精矿"}, 
      {"cpdh":"A02000101","page":"1","ca":"","mc":"磷矿石","ename":"Phosphorus ore","bm":""}, 
      {"cpdh":"A02000111","page":"2","ca":"","mc":"磷矿砂","ename":"Phosphorite grit","bm":""}, 
      {"cpdh":"A02000201","page":"2","ca":"","mc":"磷矿粉","ename":"Phosphate rock powder","bm":""}, 
      {"cpdh":"A03000101","page":"2","ca":"12447-04-0","mc":"硼矿石","ename":"Ascharite;Boric ore","bm":"硼镁矿"}, 
      {"cpdh":"A04000101","page":"2","ca":"","mc":"钾长石","ename":"Potash feldspar;Potassium feldspars","bm":""}, 
      {"cpdh":"A04000201","page":"2","ca":"12003-63-3","mc":"长石粉","ename":"Feldspar powder","bm":""}, 
      {"cpdh":"A04000301","page":"2","ca":"","mc":"光卤石","ename":"Carnallite","bm":""} 
      ]
} 
  */ 
function ObjSearch() 
  { 
    this.kw = ''; 
    this.searchCpcj= function() 
    { 
        $(vCpcj).each(function(){ 
        }); 
    } 
    this.searchCp = function() 
    { 
      // var json = eval(vCp.cppage) 
      // for(var i=0; i<json.length; i++) 
      // { 
      // alert(json[i].cpdh+" " + json[i].page) 
      // break; 
      // } 
        $.each(vCp.cppage,function(index,content){ 
              document.write('<div>'+content.cpdh+'</div><br />'); 
        }); 
    } 
  }
js 如何遍历jsonc对象?其实方法很简单。 比如有如下json对象: var obj ={”name”:”冯娟”,”password”:”123456″,”department”:”技术部”,”sex”:”女”,”old”:30}; 遍历方法:
for(var p in obj){ 
    str = str+obj[p]+','; 
    return str; 
}