jQuery UI：邮箱自动补全函数

    $('#email').autocomplete({
        delay:0,
        autoFocus:true,
        source:function(request,response){
            var hosts = ['qq.com','163.com','263.com','gmail.com','sina.com.cn'],
                term = request.term,//获取用户输入内容
                name = term,//邮箱的用户名
                host = '',//邮箱的域名
                ix = term.indexOf('@'),//@的位置
                result = [];//最终呈现的邮箱列表
            result.push(term);
            //当有@事重新分配用户名和域名
            if(ix > -1){
                name = term.slice(0,ix);
                host = term.slice(ix + 1);
            }
            if(name){
//                var findedHosts = (host ? findedHosts = $.grep(hosts,function(value,index){
//                        return value.indexOf(host) > -1;
//                    }) : hosts),
//                    findedResult = $.map(findedHosts, function(value,index) {
//                    return name + '@' + value;
//                });
                    
                //如果用户已经输入@和后面的域名
                //那么就找到相关的域名提示，比如sfsdf@.1就提示sfsdf@.163.com
                //如果没输入都提示    
                var findedHosts = [];
                if(host){
                    findedHosts = $.grep(hosts,function(value,index){
                        return value.indexOf(host) > -1;
                    });
                }else{
                    findedHosts = hosts;
                }
                var findedResult = $.map(findedHosts, function(value,index) {
                    return name + '@' + value;
                });
                result = result.concat(findedResult);
            }
            response(result);
        },
    });

另：$.grep()工具函数回调事，是true，返回的是value

$(function(){
    var arr = ['1234','jd','dang','12d3'];
    var a = $.grep(arr,function(value,index){
        return value.indexOf('d') > -1;
    });
    alert(a);
//    alert(a[1]);
//    var str = 'dangxingming';
//    alert(str.indexOf('k'));
});