export function stringIsBlank(val) {
    try {
        val = val.trim()
    } catch {

    }
    return typeof val === 'undefined' || val === null || val === ''
}

export function stringNotBlank(val) {
    return typeof val !== 'undefined' && val !== null && val !== ''
}

export function listIsBlank(val) {
    return typeof val === 'undefined' || val === null || val.length === 0
}

export function listNotBlank(val) {
    return !listIsBlank(val)
}

export function listToStr(val) {
    if (listNotBlank(val)) {
        let str = "";
        for (let i = 0, len = val.length; i < len; i++) {
            let item = val[i];
            str += item + (i === len - 1 ? "。" : "，");
        }
        return str;
    }
    return "";
}