用户名<input class="yonghu" type="text" id="user" name="u" />
var $ = JQuery;
function test(){
var user = $("#user").val(); //获取元素
var user =$(".yonghu").val();
alert(user);
}_
var user = $("input[type=password]").val();
function test(){
var user = document.getElementById("user");
alert(user.value);
user.value = user.value +"abc";
}
//jquery 遍历数组
1.
var arr =[1,2,3,4,5,6,7,8,9,10],res=0;
$.each(arr,functin(i,v){//下标,值
res+=v
})
alert(res);
2.
$(arr).each(function(i,v){
res+=v
})
for(var i=0,i<arr.length;i++){
res+=arr[i];
}
alert(res);