我理解分析承诺背后的理论(.then,.done,.when等),但我不知道如何执行它们。目前,我正在使用警报来迫使系统等待足够长的时间以履行承诺,但那是一种非常粗糙的做法。我将发布的代码完全符合我的要求。它创建一个表格,从数据库收集信息,并将其格式化到表格中。如果我拿出戒备(“迫使等待”);它不会工作,因为承诺还没有实现。我应该在哪里以及如何添加一些承诺处理程序以使其在没有警报的情况下工作?我尝试将for循环更改为do,然后添加。然后,但我无法让它不抛出错误,但是我很确定这是因为我格式化了错误的结构。任何帮助将不胜感激。谢谢!执行分析承诺
function billingReport(){
var sDate = new Date(document.getElementById("startDate").value);
var table = document.getElementById("results1");
var row, cell1, cell2, cell3, cell4;
var tableHeaderRowCount = 1;
var rowCount = table.rows.length;
for (var i = tableHeaderRowCount; i < rowCount; i++) {
table.deleteRow(tableHeaderRowCount);
}
Parse.Cloud.run("runReport", {sDate: sDate}, {
success: function(result){
alert("Successfully retrieved " + result.length + " scores.");
for(var i = 0; i < result.length; i++){
alert("forces a wait");
Parse.Cloud.run("caseHelper", {id: result[i].attributes.customer.id, className: "User", attribute: "username"},{
success: function(results){
row = table.insertRow(i);
cell1 = row.insertCell(0);
cell2 = row.insertCell(1);
cell3 = row.insertCell(2);
cell4 = row.insertCell(3);
cell1.innerHTML = result[i-1].id;
cell2.innerHTML = result[i-1].attributes.title;
cell3.innerHTML = result[i-1].attributes.hoursWorked;
cell4.innerHTML = results;
},
error: function(error){
alert("Error gathering customer information: " + error.code + " - " + error.message);
}
});
}
},
error: function(error){
alert("Error creating report :" + error.code + " - " + error.message);
}
});
}
这里是我的这个功能云代码:
Parse.Cloud.define("runReport", function(request, response) {
var sDate = request.params.sDate;
var caseList = Parse.Object.extend("Cases");
var query = new Parse.Query(caseList);
query.equalTo("status", "closed");
query.greaterThanOrEqualTo("createdAt", new Date(sDate.toISOString()));
query.find({
success: function(results){
var q = results;
response.success(q);
},
error: function(error){
response.error("Failed to create query for report.");
}
})
});
Parse.Cloud.define("caseHelper", function(request, response) {
var id = request.params.id;
var className = request.params.className;
var attribute = request.params.attribute;
var list = Parse.Object.extend(String(className));
var query = new Parse.Query(String(className));
query.equalTo("objectId", id);
query.first().done(function(result){
var a = result.get(attribute);
response.success(a);
});
});
你从哪里运行'billingReport'?它与'runReport'在同一个文件中吗?从其他地方调用runReport吗?就像从Parse以外的应用或网站一样? – MayNotBe