在javascript意外结果中迭代数组

Question

I thought that I was approaching this correctly but it appears not.

I have the following function:

function oMain(){
    var allMyData = <? echo htmlspecialchars($jsData, ENT_NOQUOTES, 'utf-8')?>;
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'x');
    data.addColumn('number', 'mid');
    var i=0;
    alert(allMyData.length);
    for(i=0;i<allMyData.length;i++){

    }

    alert(allMyData[i+1,0] + "," + allMyData[i+1,1]);
}

where allMyData looks like this: [["20121031095013","1.315"],["20121031095029","1.315"],["20121031095046","1.315"],["20121031095102","1.315"],["20121031095118","1.315"],["20121031095134","1.315"],....

which to me seems okay.

Now: My Alert shows me something like this: 20121031095013,1.315,20121031095029,1.315

where I am anticipating: 20121031095029,1.315

Could someone please help me see the error i am making?

Thank you

Answer 1

allMyData[i+1,0] returns the first array inside that other huge array. I think you meant this:

alert(allMyData[i+1][0] + "," + allMyData[i+1][1]);

That way, you are selecting the array i+1, and the the separate values inside of that.

If you want a separate alert for every array inside your array, you need to place the alert statement inside the for loop:

function oMain(){
    var allMyData = <? echo htmlspecialchars($jsData, ENT_NOQUOTES, 'utf-8')?>;
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'x');
    data.addColumn('number', 'mid');
    var i=0;
    alert(allMyData.length);
    for(i=0;i<allMyData.length;i++){
        alert(allMyData[i+1][0] + "," + allMyData[i+1][1]);
    }
}​​​​