利用js将ajax获取到的后台数据动态加载至网页中的方法

动态生成二级菜单树：

<script>
jQuery(function($) {
/**********
获取未处理报警信息总数
**************/
var result;
$.ajax({
async:false,
cache:false,
url: "alarm_findPageAlarm.do",//访问后台接口取数据
// dataType : "json",
type: 'POST',
success: function(data){
result = eval('('+ data +')');
}
});
var alarmCount;
alarmCount = result.total;

/**********

静态代码形式

**********/
/* 
<li>
<a href="#" rel="external nofollow" class="dropdown-toggle">
<i class="icon-desktop"></i>
<span class="menu-text"> 设备管理 </span>


<b class="arrow icon-angle-down"></b>
</a>


<ul class="submenu">
<li>
<a href="smartTerminal.html" rel="external nofollow" >
<i class="icon-double-angle-right"></i>
智能终端管理
</a>
</li>
<li>
<a href="labelPrinter.html" rel="external nofollow" >
<i class="icon-double-angle-right"></i>
标签打印机管理
</a>
</li>
</ul>
</li>
*/

/*****从后台取出导航栏数据******/
$.ajax({
async:true,
cache:false,
url: "user_getMenuBuf.do",
// dataType : "json",
type: 'POST',
success: function(result){
var result = eval('('+ result +')');
if(result != undefined && result.length > 0){
var firstMenu = [];
var firstHref = [];
var firstIcon = [];
var subMenu = [];

/******一级导航栏数据*******/
for (var i = 0; i < result.length; i++){
firstMenu[i] = result[i].name;
firstHref[i] = result[i].url;
firstIcon[i] = result[i].iconCls;

/*******添加li标签********/
var menuInfo = document.getElementById("menuInfo");
var firstLi = document.createElement("li");//创建新的 li元素
menuInfo.appendChild(firstLi);//将此li元素添加至页面的ul下一级中
firstLi.style.borderBottom = "0px solid #CCEBF8";//设置li下边框样式

/******设置选中li、离开li时li的样式********/
firstLi.onmouseover = function(){
this.style.background = "#23ACFA";
};
/* firstLi.onmouseover = function(){
this.style.background = "#23ACFA";
}; */
firstLi.onmouseout=function(){
this.style.background = "#0477C0";
};

/******添加a标签**********/
var firstALabel = document.createElement("a");
firstALabel.setAttribute("href", firstHref[i]);//js为新添加的a元素动态设置href属性
firstALabel.setAttribute("class", "dropdown-toggle");
//firstALabel.className = "dropdown-toggle";//兼容性好
firstALabel.setAttribute("target", "content");
//firstALabel.style.backgroundImage="url(./img/17.jpg)"
firstALabel.style.background = "#0477C0";//js为新添加的a元素动态设置背景颜色
// background:url(./img/17.jpg);
firstALabel.style.marginLeft = "20px";//js为新添加的a元素动态设置左外边距
firstLi.appendChild(firstALabel);
firstALabel.onmouseover = function(){
this.style.background = "#23ACFA";
};
/* firstALabel.onmouseover = function(){
this.style.background = "#23ACFA";
}; */
firstALabel.onmouseout=function(){
this.style.background = "#0477C0";
};


/*******添加i标签*******/
var firstILavel = document.createElement("i");
firstILavel.setAttribute("class", firstIcon[i]);
firstILavel.style.color = "#F4F8FF";//动态设置i元素的颜色
firstALabel.appendChild(firstILavel);

/*********添加span标签**********/
var firstSpan = document.createElement("span");
firstSpan.className = "menu-text";
firstSpan.innerHTML = firstMenu[i];//js为新添加的span元素动态设置显示内容
firstSpan.style.fontSize = "14.5px";//js为新添加的span元素动态设置显示内容的字体大小
firstSpan.style.color = "#66D2F1";//js为新添加的span元素动态设置显示内容的字体颜色
firstSpan.style.marginLeft = "15px";
firstALabel.appendChild(firstSpan);

if (firstMenu[i] == "报警信息管理"){
var alarmIcon = document.createElement("span");
alarmIcon.className = "badge badge-important";
alarmIcon.innerHTML = alarmCount; //alarmCount为全局变量，且是通过ajax从后台获取到的
firstSpan.appendChild(alarmIcon);
}

if (result[i].children.length > 0){
var secondHref = [];
var secondMenu = [];
var secondIcon = [];

/*******添加b标签********/
var firstBLabel = document.createElement("b");
firstBLabel.className = "arrow icon-angle-down";
firstBLabel.style.color = "white";
firstALabel.appendChild(firstBLabel);

/********添加ul标签************/
var secondUl = document.createElement("ul");
secondUl.setAttribute("class", "submenu");
firstLi.appendChild(secondUl);

for (var j = 0; j < result[i].children.length; j++){
secondHref[j] = result[i].children[j].url;
secondMenu[j] = result[i].children[j].name;
secondIcon[j] = result[i].children[j].iconCls;

/******添加li标签*******/
var secondLi = document.createElement("li");
secondLi.style.background = "#CCEBF8";
secondUl.appendChild(secondLi);

/*******添加a标签*******/
var secondALabel = document.createElement("a");
secondALabel.setAttribute("href", secondHref[j]);
secondALabel.setAttribute("target", "content");
//secondALabel.style.background = "#CCEBF8";
secondLi.appendChild(secondALabel);

/*******添加i标签**********/
var secondILabel = document.createElement("i");
secondILabel.setAttribute("class", "icon-double-angle-right");
secondALabel.appendChild(secondILabel);

/******添加二级导航信息********/
secondALabel.innerHTML = secondMenu[j];
secondALabel.style.fontSize = "15px";
//secondALabel.style.marginLeft = "60px";
}
}
}
   }
  }, 
 error: function() { 
 alert("加载菜单失败"); 
 } 
});
})
</script>

静态生成菜单树的代码：

生成菜单树的效果：