js 常用汇总

/**
 * 改变日期格式
 *"2019/01/20 10:15:00";
 */
function changeDateForm(endTime){//20190114195948
	if(endTime.length != 14 ){
		return "";
	}
	var year =endTime.substring(0,4);
	var month =endTime.substring(4,6);
	var date =endTime.substring(6,8);
	var hour = endTime.substring(8,10);
	var minute = endTime.substring(10,12);
	var second =endTime.substring(12,14);
	
	return year + symbol1 + month + symbol1 + date + symbol3 + hour + symbol2 + minute + symbol2 + second;

}

//对象转Json
    var toJson = function (obj) {
        if (window.JSON) {
            return JSON.stringify(obj);
        } else {
            alert("JSON转换错误!");
            return null;
        }
    };

 //返回值Json转对象
    var jsonToObj = function (text) {
        if (window.JSON) {
            return JSON.parse(text);
        } else {
            return eval("(" + text + ")");
        }
    };