• 时间戳转换为年月日核心代码

/*时间戳，以ms为单位*/
function changeTime (inputTime){
    var date = new Date(inputTime);
    var y = date.getFullYear();
    var m = date.getMonth() + 1;
    m = m < 10 ? ('0' + m) : m;
    var d = date.getDate();
    d = d < 10 ? ('0' + d) : d;
    var h = date.getHours();
    h = h < 10 ? ('0' + h) : h;
    var minute = date.getMinutes();
    var second = date.getSeconds();
    minute = minute < 10 ? ('0' + minute) : minute;
    second = second < 10 ? ('0' + second) : second;
    return y + '-' + m + '-' + d+' '+h+':'+minute+':'+second;
}

• input标签只输入数字

 <span>
    <input class="idCard" type="text" name="idCard" placeholder="身份证"   onkeyup="this.value=this.value.replace(/\D/g,'')" onafterpaste="this.value=this.value.replace(/\D/g,'')"></span>

• JS运算
  浮点数运算会有计算bug
  精确两位用toFixed(2)
• 数组的深拷贝复杂对象集合

var deepCopy = function(o) {
    if (o instanceof Array) {
        var n = [];
        for (var i = 0; i < o.length; ++i) {
            n[i] = deepCopy(o[i]);
        }
        return n;

    } else if (o instanceof Object) {
        var n = {}
        for (var i in o) {
            n[i] = deepCopy(o[i]);
        }
        return n;
    } else {
        return o;
    }
}

• url跳转页面时带参为中文，格式化

function(){
        let info = JSON.stringify(item);
        let recode = encodeURIComponent(info);
        console.log(recode);
        window.location.href="health-evaluation-scheme-pic.html?item="+recode
}

• 字符串截取，中文

function getQueryString(key){
    var reg = new RegExp("(^|&)"+key+"=([^&]*)(&|$)");
    var result = window.location.search.substr(1).match(reg);
    return result?decodeURIComponent(result[2]):null;
}

• 字符串截取，非中文

function GetQueryString(name){
    var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)");
    var r = window.location.search.substr(1).match(reg);
    if(r!=null)return  unescape(r[2]); return null;
}