下面方法只是簡(jiǎn)單封裝名段，用來理解原生ajax原理
調(diào)用方法
ajax({
method: 'post',
url: 'user-center/app/shop/follow',
data: {
access_token: 12312,
shop_id: 123123
},
success: function(response) {
console.log(response);
}
});
封裝方法
function ajax(opt) {
opt = opt || {};
opt.method = opt.method.toUpperCase() || 'POST';
opt.url = opt.url || '';
opt.async = opt.async || true;
opt.data = opt.data || null;
opt.success = opt.success || function() {};
var xmlHttp = null;
if (XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
} else {
xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
}
var params = [];
for (var key in opt.data) {
params.push(key + ':' + opt.data[key]);
}
var postData = params.join('&');
console.log(postData);
if (opt.method.toUpperCase() === 'POST') {
xmlHttp.open(opt.method, opt.url, opt.async);
//設(shè)置請(qǐng)求頭
xmlHttp.setRequestHeader('Accept', 'application/json, text/javascript, */*; q=0.01');
xmlHttp.setRequestHeader('Content-Type', 'application/json');
xmlHttp.setRequestHeader('Cache-Control', 'private');
xmlHttp.send(JSON.stringify(opt.data));
} else if (opt.method.toUpperCase() === 'GET') {
xmlHttp.open(opt.method, opt.url + '?' + postData, opt.async);
xmlHttp.send(null);
}
xmlHttp.onreadystatechange = function() {
if (xmlHttp.readyState == 4 && xmlHttp.status == 200) {
opt.success(xmlHttp.responseText);
}
};
}
