list内属性为null和undefined删除掉```js [ { "Title": "呼吸次/分", "Name"

    [ 
    { "Title": "呼吸 次/分", "Name": "chartBreathing", "StartDateKeyword": null, "AfterOperaDaysFromZero": true, "PreserveStartKeywordOrder": false, "LayoutType": "Normal", "TickStep": "1", "TickLineVisible": true, "ValueType": "TickText", "SpecifyHeight": "0", "AutoHeight": false, "TextFontName": null, "TextFontSize": null, "LoopTextList": null, "UpAndDownTextType": "None", "TitleAlign": "Center", "SpecifyTitleWidth": "0", "PageTitleTexts": null }, 
    { "Title": "大便 次/日", "Name": "billShitCount", "StartDateKeyword": null, "AfterOperaDaysFromZero": true, "PreserveStartKeywordOrder": false, "LayoutType": "Normal", "TickStep": "6", "TickLineVisible": true, "ValueType": "TickText", "SpecifyHeight": "0", "AutoHeight": false, "TextFontName": null, "TextFontSize": null, "LoopTextList": null, "UpAndDownTextType": "None", "TitleAlign": "Center", "SpecifyTitleWidth": "0", "PageTitleTexts": null }
    ] 
    使用前端javascript把所有属性值为null和undefined删除掉
    let chartData = [/* 原始数据 */];

chartData.forEach(
function(item) { 
for (let key in item) { 
if (item.hasOwnProperty(key) && (item[key] === null || item[key] === undefined)) {
delete item[key]; 
} 
} 
}
);

console.log(chartData); // 输出已删除null和undefined属性值的数据