个人常用JavaScript

1.拷贝文本到剪贴板

function copyText(text) {
    var textarea = document.createElement("input");//创建input对象
    var currentFocus = document.activeElement;//当前获得焦点的元素
    document.body.appendChild(textarea);//添加元素
    textarea.value = text;
    textarea.focus();
    if(textarea.setSelectionRange)
        textarea.setSelectionRange(0, textarea.value.length);//获取光标起始位置到结束位置
    else
        textarea.select();
    try {
        var flag = document.execCommand("copy");//执行复制
    } catch(eo) {
        var flag = false;
    }
    document.body.removeChild(textarea);//删除元素
    currentFocus.focus();
    return flag;
}

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2.格式化时间/时间格式化

Date.prototype.format = function (format) {
    var args = {
        "M+": this.getMonth() + 1,
        "d+": this.getDate(),
        "h+": this.getHours(),
        "m+": this.getMinutes(),
        "s+": this.getSeconds(),
        "q+": Math.floor((this.getMonth() + 3) / 3),  //quarter
        "S": this.getMilliseconds()
    };
    if (/(y+)/.test(format))
        format = format.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
    for (var i in args) {
        var n = args[i];
        if (new RegExp("(" + i + ")").test(format))
            format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? n : ("00" + n).substr(("" + n).length));
    }
    return format;
};

function strTimeFormat(strTime) {
    var times = strTime.toString().replace(/^(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})$/, "$1-$2-$3 $4:$5:$6");
    return times;
}

//使用方法
console.log(new Date().format("yyyy-MM-dd hh:mm:ss"));
console.log(strTimeFormat("2019-12-12 12:00:00"));

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3.显示提示信息 

    
    
    
    
    
    
    
    

    
    
    

    

    
    


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