完全删除 JSON 中的行

Question

我正在使用一种方法来删除 JSON 中的特定行。用户按下一个按钮，该按钮确定要删除哪一行。我知道正在传入正确的索引，但我的问题是，当我尝试删除该行时，它只是将其替换为null，所以仍然有一些东西。我怎样才能完全删除它？

function removeTest(place) {
    var parsedObject = JSON.parse(localStorage["flexuralStrengthSamples"]);
    delete parsedObject[parseInt(place.data.text)];

    localStorage["flexuralStrengthSamples"] = JSON.stringify(parsedObject);

    console.log(JSON.stringify(parsedObject));

    displaySamples();
}

以及我生成的 JSON：

[{"Result":"Fail","Method":"T97E-v1","Beam1":{"TestingMachineId":"1","BeamAge":"1","WidthUpper":1,"WidthCenter":1,"WidthLower":1,"WidthAverage":1,"DepthRight":1,"DepthCenter":1,"DepthLeft":1,"DepthAverage":1,"MaxLoad":1,"FS":18,"PSI":"18.00000","BreakOutside":"No"},"Beam2":{"BeamAge":"","WidthUpper":null,"WidthCenter":null,"WidthLower":null,"WidthAverage":null,"DepthRight":null,"DepthCenter":null,"DepthLeft":null,"DepthAverage":null,"MaxLoad":null,"FS":null,"PSI":"NaN"},"WaitForCuring":"No","AverageOfBeams":"NaN"},null]

在这种情况下，我尝试删除两个中的第二个。

Answer 1

根据生成的 JSON，您有一个Array []of Objects {}.

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为了从Array（并更新它length）中删除项目，您必须使用splice

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delete有关运算符的更多阅读：

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删除数组元素

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删除数组元素时，数组长度不受影响。即使您删除了数组的最后一个元素，这也成立。

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例子

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var arr = [ {name: "Hello"}, {name: "World"} ];\n\n// Delete does not modify an array\'s length, hence the "undefined"\ndelete arr[1]; // => [Object, undefined \xc3\x97 1]\n\n// Splice will change the contents of an array and update its length\narr.splice(1,1); // => [Object]\n

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