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//方法1
let size = 8;
let temp1 = "", temp2 = "";
for (let i = 0; i < size; ++i) {
    if (i % 2 === 0) {
        temp1 += " ";
        temp2 += "#";
    } else {
        temp1 += "#";
        temp2 += " ";
    }
}
for (let i = 0; i < size; ++i) {
    console.log(i % 2 === 0 ? temp1 : temp2);
}

//方法2
let otherSize = 6;
for (let i = 0; i < otherSize; ++i) {
    //因为console.log输出后自动回车, 而我现在又不知道怎么样就不回车,故用此法模拟输出不回车
    let b = i % 2 === 0;
    let tempString = b ? " " : "#";
    for (let j = 1; j < otherSize; ++j) {
        if (b) {
            tempString += (j % 2) === 0 ? " " : "#";
        } else {
            tempString += (j % 2) === 0 ? "#" : " ";
        }
    }
    console.log(tempString);
}