Question

nodejs + express怎么实现Ajax方式及其简单功能

Answer 1

componentDidMount: function() {
//ajax请求
var xmlhttp;
if(window.XMLHttpRequest) {
xmlhttp = new XMLHttpRequest();
}else if(window.ActiveXObject) {
xmlhttp = new ActiveXObject(‘Microsoft.XMLHTTP’);
}else {
alert(‘必须提高浏脊吵神览器版本樱亏才能浏览!’);
return false;
}
//回调
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState == 4) {
if(xmlhttp.status == 304 || (xmlhttp.status >= 200 && xmlhttp.status < 300)) {
var renderMessage = JSON.parse(xmlhttp.responseText);
if(this.isMounted()){
this.setState({
data: renderMessage,
});
}
}
}
}.bind(this);
//请求
xmlhttp.open(‘post’,’/photo.list.server’,true);
xmlhttp.setRequestHeader(“Content-Type”,“application/x-www-form-urlencoded;charset=utf-8”);
xmlhttp.send(null);
}
以上是前端的代码。
后台其实逻碰配辑如下:
var mongoose = require(‘mongoose’);
var PhotoList = mongoose.model(‘PhotoList’);
module.exports = function(req, res, next) {
PhotoList.find({}, function(err, docs) {
if(err) {
res.end(‘Error’);
return next();
}
res.send(JSON.stringify(docs));
});
}