一、
- 构建一个数组【“00:00”,"00:05"..."23:55"】的数组
function buildAxis(){ var ary=[]; ary.push("00:00"); var start = Date.UTC(2017,1,1,-8,0,0); for(var i=0;i<288;i++){ start += 1000*60*5;//(5分钟的毫秒数) var _date=new Date(start); var Hours=cal(_date.getHours()); var Minutes=cal(_date.getMinutes()); ary.push(Hours+":"+Minutes); } ary.pop(); return ary; } function cal(o){ if(o<10&&String(o).length==1){ return "0"+o; }else{ return o; } }
- 根据输入的年月份（2017-09），返回月份每一天的数组 【“2017-09-01*******2017-09-30”】注意天数
/** * @desc 根据月份得出当前日月年天数的数组【2018-06-01,2018-06-02...2018-06-30】。 * @param str * @return {Array} arr */ function getCountDays(str) { var year=str.substr(0,4); var month=str.substr(-2); var curDate = new Date(year,month,0);//如果是0返回最后一天 /* 返回当月的天数 */ var day= curDate.getDate(); var dayArr=[]; for (var k = 1; k <=day; k++){ dayArr.push(str.substr(0,4)+"-"+str.substr(-2)+"-"+add0(k)); } return dayArr; } function add0(o){ if(o<10&&String(o).length==1){ return "0"+o; }else{ return o; } } var str="2017-06"; var arr=getCountDays(str); console.log(arr);//["2017-06-01","2017-06-02","2017-06-03"..."2017-06-30"]
附加实例，$.grep筛选
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
<style type="text/css">
body, html,#allmap { 100%;height: 100%;overflow: hidden;margin:0;font-family:"微软雅黑";}
</style>
<script type="text/javascript" src="http://api.map.baidu.com/api?v=2.0&ak=SLrOIdVUUI5fbvsZTMqTFshsG993NBAG"></script>
<title>地图展示</title>
<style type="text/css">
img { 150px !important;}
</style>
</head>
<body>
</body>
</html>
<script type="text/javascript" src="js/jquery-1.11.3.js"></script>
<script type="text/javascript">
//原数组
var rowData=[
{date:'2017-09-18',fzlMax:0.18,fzlMin:0.12},
{date:'2017-09-20',fzlMax:0.25,fzlMin:0.2},
{date:'2017-09-19',fzlMax:0.22,fzlMin:0.12}
]
//需要的数组格式
var series=[
{
name:'最大负载',
type:"line",
data:[]
},{
name:'最小负载',
type:"line",
data:[]
}
]
//第一步：组成每一天的大数组 dateArr ["2017-09-01"****"2017-09-31"]
window.onload=function(){
var str="2017-09";
var dateArr=getCountDays(str);
//第二部：循环数组
for(var j=0;j<dateArr.length;j++){
var ary=$.grep(rowData,function(n,dIndex){
return (n.date==dateArr[j]);
})
if(ary.length>0){
series[0].data.push(ary[0].fzlMax);
series[1].data.push(ary[0].fzlMin);
}else{
series[0].data.push("-");
series[1].data.push("-");
}
}
console.log(series);
}
function add0(o){
if(o<10&&String(o).length==1){
return "0"+o;
}else{
return o;
}
}
function getCountDays(str) {
var year=str.substr(0,4);
var month=str.substr(-2);
var curDate = new Date(year,month,0);//如果是0返回最后一天
/* 返回当月的天数 */
var day= curDate.getDate();
var dayArr=[];
for (var k = 1; k <=day; k++) {
dayArr.push(str.substr(0,4)+"-"+str.substr(-2)+"-"+add0(k));
}
return dayArr;
}
</script>
- 两个数组相除
Number.prototype.toMyFixed=function(){ try{ if(Math.abs(this)>1000){ return parseFloat(this.toFixed(0),10); }else if(Math.abs(this)<1){ return parseFloat(this.toFixed(4),10); }else{ return parseFloat(this.toFixed(2),10); } }catch(e){ return this; } } var arr1=[2,4,6]; var arr2=[1,2,3]; alert(calc(arr1,arr2)); //[2,2,2];两个数组相除 function calc(arr1,arr2){ var arr=[]; for(var i=0;i<arr1.length;i++){ var val=devided(arr1[i],arr2[i]); arr.push(val); } return arr; } function devided(topNum,botNum){ if(isNaN(topNum)||isNaN(botNum)||parseFloat(botNum)==0){ return "-"; }else{ return Number(topNum/botNum).toMyFixed(); } }
3.数组求和
/** * @desc 对一个数组进行求和。 * @param 数组 * @return {string} sum */ function arrSum(arr){ if(!arr||arr.length===0){ return 0; } var sum=arr.reduce(function(x,y){ x=isNaN(x)?0:x; y=isNaN(y)?0:y; return Number(parseFloat(x)+parseFloat(y)).toFixed(2); },0) return sum; }
4.将样式字符串改成对象 2019/06/12 组态中按钮样式合并用到
var style="100px;height:200px;border:1px solid red;border-radius:8px 10px 2px 5px"; console.log(styleToObject(style));//{100px,height:200px,border:1px solid red,border-radius:8px 10px 2px 5px} /**把样式字符串样式转化为{} *@param style:样式字符串 **/ function styleToObject(style) { let styleObject = {} if (style && style != '' && style !== 'null') { const len = style.length styleObject = style.charAt(len - 1) === ';' ? '{' + style + '}' : '{' + style + ';}' // 统一样式后面以";"结束 // 将字符串转化为json标准字符串 styleObject = styleObject.replace(/{/g, '{"') styleObject = styleObject.replace(/:/g, '":"') styleObject = styleObject.replace(/;/g, '","') styleObject = styleObject.replace(/,"}/g, '}') // 将json标准字符串转化为{}对象 styleObject = JSON.parse(styleObject) } return styleObject }
list转树 手写
/* *list转树 */ var data = [ {name:1,id:11,pid:1}, {name:12,id:12,pid:1}, {name:111,id:111,pid:11}, {name:112,id:112,pid:11}, {name:121,id:121,pid:12} ] function toTree(list){ let map={},result=[] list.forEach(item=>map[item.id] = item); list.forEach((it,idx)=>{ let parent = map[it.pid] if(parent){ (parent.children || (parent.children = [])).push(it) }else{ result.push(it) } }) return result } console.log(toTree(data))