Don't want to waste time writing repetitive code (2)

Countdown:

<span style="font-family:SimSun;font-size:10px;">/* Implement multiple times for countdown, or format the time directly: time is a timestamp*/
var deadline = {
    counting:function(ele,timer){
        var _this=this;
        setTimeout(function(){
            if(timer >=0 ){
                ele.html(_this.transfer(timer-1));
                _this.counting(ele,timer-1);
            }
        },1000)
    },
    transfer:function(time){
        var d=Math.floor(time/86400);
        var h=Math.floor((time-d*86400)/3600);
        var m=Math.floor((time-d*86400-h*3600)/60);
        var s=time-d*86400-h*3600-m*60;
        return d+'day'+h+'hour'+m+'minute'+s+'second';
    },
    transferTime:function(time){/* Compare with the current time, if it is less than the current time, it will not be displayed*/
        var now = new Date(),
            endDate = new Date(time*1000),
            leftTime = endDate.getTime()-now.getTime(),
            leftsecond  =  parseInt(leftTime/1000);
        if(  leftsecond >0 ){
            var date = new Date(time*1000);
            var year = date.getFullYear();
            var month = date.getMonth()+1;
            month = month < 10 ? ( '0'+month ) : month;
            var day = date.getDate() < 10 ? ( '0'+date.getDate() ) : date.getDate();
            var hour = date.getHours() < 10 ? ( '0'+date.getHours() ) : date.getHours();
            var minute = date.getMinutes() < 10 ? ( '0'+date.getMinutes() ) : date.getMinutes();
            var second = date.getSeconds() < 10 ? ( '0'+date.getSeconds() ) : date.getSeconds();
            return year+'-'+month+'-'+day+' '+hour+':'+minute+':'+second;
        }else{
            return '';
        }
    }
};</span>

Amount formatted in thousands:

amount.toString().replace(^/\d{1,3}(?=(\d{3})+(\.\d*)$)/g, '$&,');

js font adaptation function:

function fixRem(){
        var windowWidth =  window.innderWidth || document.documentElement.clientWidth || document.body.clientWidth;
        windowWidth = windowWidth < 320 ? 320 : windowWidth ;  //body min-width in css
        var rootSize = 20 * ( windowWidth / 360);
        rootSize = rootSize> 36? 36: rootSize;
        var htmlNode = document.getElementsByTagName("html")[0];
        htmlNode.style.fontSize = rootSize+'px';
    }

css font adaptation method:

@min-font-size: 20px;
@max-font-size: 36px;
@min-screen: 360px;
@max-screen: 800px;

:root {
    font-size: @min-font-size;
}

@media (min-width:@min-screen) and (max-width:@max-screen) {
    :root {
        font-size: calc( @min-font-size + (@max-font-size - @min-font-size) * ((100vw - @min-screen) / (@max-screen - @min-screen)));
    }
}

@media (min-width:@max-screen) {
    :root {
        font-size: @max-font-size;
    }
}

Get the json object of the form:

function getFormJson(form) {
    var o = {};
    var a = $(form).serializeArray();
    $.each(a, function() {
        if (!this.name) return true;
        if (o[this.name] !== undefined) {
            if (!o[this.name].push) {
                o[this.name] = [o[this.name]];
            }
            o[this.name].push(this.value || '');
        } else {
            o[this.name] = this.value || '';
        }
    });
    return o;
}

Get object length

function getPropertyCount(o){  
   var n, count = 0;  
   for(n in o){  
      if(o.hasOwnProperty(n)){  
         count++;  
      }  
   }  
   return count;  
}

Object.keys(obj).length

Restrict the input box to only enter numbers (retain N decimal places), regardless of pasting

//Get the position of the current cursor in the text box
function getCurPosition(domObj) {
    var position = 0;
    if (domObj.selectionStart || domObj.selectionStart == '0') {
        position = domObj.selectionStart;
    }
    else if (document.selection) { //for IE
        domObj.focus();
        var currentRange = document.selection.createRange();
        var workRange = currentRange.duplicate();
        domObj.select();
        var allRange = document.selection.createRange();
        while (workRange.compareEndPoints("StartToStart", allRange) > 0) {
            workRange.moveStart("character", -1);
            position++;
        }
        currentRange.select();
    }
    return position;
}

$.fn.decimalinput = function(num) {
    $(this).css("ime-mode", "disabled");
    this.on("keypress", function(e) {
        if (e.charCode === 0) return true; //non-character keys for firefox
        var code = (e.keyCode? e.keyCode: e.which); // and Firefox IE
        if (code >= 48 && code <= 57) {
            var pos = getCurPosition(this);
            var dotPos = this.value.indexOf(".");
            if ( code == 48 && pos == 0) {
                return false;
            }
            if (dotPos > 0 && pos > dotPos) {
                if (pos > dotPos + num) return false;
                if (this.value.substr(dotPos + 1).length < num)
                    return true;
                else
                    return false;
            }
            return true;
        }
        //enter"."
        if (code == 46) {
            if (/^[0-9]+\.$/.test(this.value + String.fromCharCode(code)))
                return true;
        }
        return false;
    });
    this.on("input propertychange", function() {
        var value = this.value;
        if( value.substr(0,1)== 0 ){
            value = value.substring(1, value.length);
            this.value = value;
        }
        var reg = new RegExp('(?:[1-9]\d*?(?:\.\d{0,'+num+'})?)$');
        if( !reg.test(value)){
            this.value  = value.replace(/[^0-9\.]/g, "");
        }
    });
    this.on("paste dragenter contextmenu", function() {
        return false;
    });
};

$("#property_money").decimalinput(4);

Notice:

1. selectionStart does not work for number input, it seems that it only works for input type of text

2. ime-mode: css property, which sets or retrieves whether the user is allowed to activate the input method (IME) state for inputting Chinese, Korean, Japanese, etc.

refer to:

http://www.qdfuns.com/notes/26716/6ada0d47a845cc2f581bd85d28d270c9.html

http://blog.csdn.net/huangyong19870618/article/details/5873044

http://www.cnblogs.com/nackman/archive/2013/01/28/2880154.html

eval Executes in the current scope only if called directly and the calling function is  itself. evalOtherwise, its scope is global. The use of eval is not recommended.

// call directly
var foo = 1;
function test() {
    var foo = 2;
    eval('foo = 3');
    return foo;
}
test(); // 3
foo; // 1

//indirect call
var foo = 1;
function test() {
    var foo = 2;
    var bar = eval;
    bar('foo = 3');
    return foo;
}
test(); // 2
foo; // 3

setTimeout  and  setInterval  both can accept a string as their first argument, which is used internally  eval. This string is always executed in the global scope, so  eval  is not called directly in this case. It is recommended to use anonymous functions for the first parameter.