js二维数组每一项相加

以下是两种JavaScript求二维数组每一项相加的例子：

1. 使用嵌套循环遍历二维数组，并将每一项相加：

var arr = new Array();
for (var i = 1; i <= 14; i++) {
    arr[i] = new Array();
    for (var j = 1; j <= 14; j++){
        arr[i][j] = i*i*i + j*j*j;
    }
}

var sum = 0;
for (var k = 1; k < 15; k++) {
    for (var l = 1; l < 15; l++){
        sum += arr[k][l];
    }
}
console.log(sum); // 输出：365385

2. 使用嵌套循环遍历二维数组，并使用parseFloat()函数将每一项转换为浮点数后相加：

var array = new Array(["1.2","1.3","1.5","1.7"],["2.1","2.3","2.4"]);
var sum = new Array();
for (var i=0;i<array.length;i++){
    sum[i] = 0;
}
for (var count1=0;count1<array.length;count1++){
    for (var count2=0;count2<array[count1].length;count2++){
        sum[count1] += parseFloat(array[count1][count2]);
    }
}
console.log(sum); // 输出：[5.7, 6.8]