利用js将ajax获取到的后台数据动态加载至网页中的方法

/*从后台取出导航栏数据**/
$.ajax({
async:true,url: "user_getMenuBuf.do",// dataType : "json",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");
}
});
})