我正在尝试循环访问此 json 对象，我想返回“点”内项目的关联点、总数和百分比。
代码每次循环时仅输出 >100，这是最后一项
<%
var connection = appdata.cao.years,
year = null,
totalStudents = null,
points = null
for(var i=0; i < connection.length;i++) {
year = connection[i].year;
totalStudents = connection[i].total;
for(var j = 0; j < connection[i].points.length;j++){
points = connection[i].points[j].id;
}
%>
<p>
<%=year %>,
<%=totalStudents %>
<%=points %>
</p>
<%}%>
这是 JSON
{
"name":"cao json",
"description":"breakdown of cao statistics",
"cao":{
"id":1,
"years":[
{
"id":"1",
"year":"2015",
"total":"55045",
"points":[
{
"id":"2",
"points":"600",
"total":"215",
"percent":"0.4"
},
{
"id":"3",
"points":"500-599",
"total":"5431",
"percent":"9.9"
},
{
"id":"4",
"points":"400-499",
"total":"14097",
"percent":"25.6"
},
{
"id":"5",
"points":"300-399",
"total":"14446",
"percent":"26.2"
},
{
"id":"6",
"points":"200-299",
"total":"9768",
"percent":"17.7"
},
{
"id":"7",
"points":"100-199",
"total":"6562",
"percent":"11.9"
},
{
"id":"8",
"points":" >100",
"total":"4526",
"percent":"8.2"
}
]
},
{
"id":"9",
"year":"2014",
"total":"54025",
"points":[
{
"id":"10",
"points":"600",
"total":"162",
"percent":"0.3"
},
{
"id":"11",
"points":"500-599",
"total":"5088",
"percent":"9.4"
},
{
"id":"12",
"points":"400-499",
"total":"13447",
"percent":"24.9"
},
{
"id":"13",
"points":"300-399",
"total":"14047",
"percent":"26"
},
{
"id":"14",
"points":"200-299",
"total":"9584",
"percent":"17.7"
},
{
"id":"15",
"points":"100-199",
"total":"6926",
"percent":"12.8"
},
{
"id":"16",
"points":" >100",
"total":"4771",
"percent":"8.8"
}
]
},
{
"id":"17",
"year":"2013",
"total":"52767",
"points":[
{
"id":"18",
"points":"600",
"total":"152",
"percent":"0.3"
},
{
"id":"19",
"points":"500-599",
"total":"4813",
"percent":"9.1"
},
{
"id":"20",
"points":"400-499",
"total":"12803",
"percent":"24.3"
},
{
"id":"21",
"points":"300-399",
"total":"13381",
"percent":"25.4"
},
{
"id":"22",
"points":"200-299",
"total":"9566",
"percent":"18.1"
},
{
"id":"23",
"points":"100-199",
"total":"6914",
"percent":"13.1"
},
{
"id":"24",
"points":" >100",
"total":"5138",
"percent":"9.7"
}
]
},
{
"id":"25",
"year":"2012",
"total":"52589",
"points":[
{
"id":"26",
"points":"600",
"total":"165",
"percent":"0.2"
},
{
"id":"27",
"points":"500-599",
"total":"5026",
"percent":"9.6"
},
{
"id":"28",
"points":"400-499",
"total":"12395",
"percent":"23.6"
},
{
"id":"29",
"points":"300-399",
"total":"13170",
"percent":"25"
},
{
"id":"30",
"points":"200-299",
"total":"9588",
"percent":"18.2"
},
{
"id":"31",
"points":"100-199",
"total":"6999",
"percent":"13.3"
},
{
"id":"32",
"points":" >100",
"total":"5276",
"percent":"10"
}
]
},
{
"id":"33",
"year":"2011",
"total":"54341",
"points":[
{
"id":"34",
"points":"600",
"total":"162",
"percent":"0.3"
},
{
"id":"35",
"points":"500-599",
"total":"4863",
"percent":"8.6"
},
{
"id":"36",
"points":"400-499",
"total":"12235",
"percent":"22.5"
},
{
"id":"37",
"points":"300-399",
"total":"13860",
"percent":"18.4"
},
{
"id":"38",
"points":"200-299",
"total":"9966",
"percent":"18.4"
},
{
"id":"39",
"points":"100-199",
"total":"7477",
"percent":"13.8"
},
{
"id":"40",
"points":" >100",
"total":"5928",
"percent":"10.9"
}
]
},
{
"id":"34",
"year":"2010",
"total":"54480",
"points":[
{
"id":"35",
"points":"600",
"total":"136",
"percent":"0.2"
},
{
"id":"36",
"points":"500-599",
"total":"4564",
"percent":"8.4"
},
{
"id":"37",
"points":"400-499",
"total":"11973",
"percent":"22"
},
{
"id":"38",
"points":"300-399",
"total":"13878",
"percent":"25.5"
},
{
"id":"39",
"points":"200-299",
"total":"10391",
"percent":"19.1"
},
{
"id":"40",
"points":"100-199",
"total":"7294",
"percent":"13.4"
},
{
"id":"41",
"points":" >100",
"total":"6244",
"percent":"11.5"
}
]
}
]
}
}
代码是 JavaScript，包裹在 ExpressJS 标签内
最佳答案
你有变量points = null，它重新分配给每个循环迭代，所以而不是
points = connection[i].points[j].id;
你应该使用
points.push(connection[i].points[j].id);
以及更改之前
points = null
到
points = []
关于javascript - 循环返回数组的最后一项，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32421444/