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You are creating your array as a String.
You need to create an array of objects [{},{},{}].
The method used to INSERT a new object in an array is PUSH().
Check the fiddle. Now it´s working OK (move the mouse on the screen to see the chart is there (you will only see it when mouse is over it):
window.onload = function() {
var arr = ['HTML', 'CSS', 'JS'],
i, data;
data = [];
for (i = 0; i < arr.length; i++) {
if (i == arr.length - 1) {
data.push({
value: "300",
color: "#fff",
highlight: "#aaa",
label: arr[i]
});
} else {
data.push({
value: "300",
color: "#fff",
highlight: "#aaa",
label: arr[i]
});
}
}
var dat = data;
var ctx = document.getElementById("chart-area").getContext("2d");
window.myBar = new Chart(ctx).Doughnut(dat, {
responsive: true,
});
};
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://rawgit.com/nnnick/Chart.js/master/Chart.js"></script>
<canvas id="chart-area"></canvas>
Source:stackexchange.com