原生ajax发送POST和GET请求

我就是我 2022-10-11 01:11 191阅读 0赞

在写简单几个活动页面时可能不想引入其它文件，这时候发送请求消息给后端，可以自己写原生方法，以下是参考代码：

// 原生ajax 
        var ajax = function() { };
        ajax.prototype = { 
            request: function(method, url, callback, postVars) { 
                var xhr = this.createXhrObject();
                xhr.onreadystatechange = function() { 
                    if (xhr.readyState !== 4) return;
                    (xhr.status === 200) ?
                        callback.success(xhr.responseText, xhr.responseXML) :
                        callback.failure(xhr,status);
                };
                if (method !== "POST") { 
                    url += "?" + this.JSONStringify(postVars);
                    postVars = null;
                } else { 
                    postVars = this.JSONStringify(postVars);
                }
                xhr.open(method, url, true);
                xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
                xhr.setRequestHeader("Accept", "application/json, text/javascript, */*; q=0.01");
                xhr.send(postVars);
            },
            createXhrObject: function() { 
                var methods = [
                    function() {  return new XMLHttpRequest(); },
                    function() {  return new ActiveXObject("Msxml2.XMLHTTP"); },
                    function() {  return new ActiveXObject("Microsoft.XMLHTTP"); }
                ],
                i = 0,
                len = methods.length;
                for (; i < len; i++) { 
                    try { 
                        methods[i]();
                    } catch(e) { 
                        continue;
                    }
                    this.createXhrObject = methods[i];
                    return methods[i]();
                }
                throw new Error("ajax created failure");
            },
            JSONStringify: function(obj) { 
                var str = '';
                for(i in obj){ 
                    str += i+'='+obj[i]+'&'
                }
                return str.slice(0,-1);
            }
        };
        // ajax完成后的处理函数
        var callback = { };
        callback.success = function(text, xml){ 
            text = eval('('+text+')');
            var html = '';
            for (var i = 0; i < text.datas.ad.length; i++) { 
                html += '<li>'
                html += ' <span class="ad-dot"></span>'
                html += ' <a href="'+text.datas.ad[i].reurl+'" target="_blank">'+text.datas.ad[i].reurl_title+'</a>'
                html += '</li>'
            };
            adText.innerHTML = html;
        }
        callback.failure = function(xhr, status){ 
            alert('广告代码获取失败')
        }
        var ajax = new ajax();
        ajax.request('POST', '<{$apiurl}>index.php?route=website/goods/textAdCover', callback, param)