commone js functions

functions.js

function isFunction(fun){
    return typeof fun === 'function';
}
function isObject(obj){
    return toString.apply(obj) == '[object Object]';
}
function isString(str){
    return typeof str === 'string';
}
function isNumeric(num){
    return num - parseFloat(num) >= 0;
}
function isArray(arr){
    // return Object.prototype.toString.apply(arr) === '[object Array]';
    return toString.apply(arr) === '[object Array]';
}

function hasClass(obj, str){
    return obj.className.match(new RegExp( '(\\s|^)'+ str + '(\\s|$)' ) );
}

function addClass(obj, str){
    if( !hasClass( obj, str) )
        obj.className += ' ' + str;
}

function removeClass(obj, str){
    if( hasClass( obj, str ) ){
        var reg = new RegExp('(\\s|^)' + str +'(\\s|$)');
        obj.className = obj.replace(reg, '');
    }
}

function inArray(value,arr,index){
    if( typeof value === 'string' || typeof value === 'number' ){
        for (var i = 0, len = arr.length; i < len; i++) {
            if( arr[i] === value ){
                return index ? i : true;
            }
        }
        return false;
    }
}

function inObject(value, obj){
    if( typeof value === 'string' ){
        return value in obj;
    }
}

function toggleClass(obj, str){
    if( hasClass( obj, str ) ){
        removeClass( obj, str);
    }else{
        addClass( obj, str );
    }
}

//延迟函数
function sleep(milliSeconds) {
    var startTime = new Date().getTime();
    while (new Date().getTime() < startTime + milliSeconds);
}

//关闭浏览器tab 函数
function closeWin() {
    window.opener = null;
    window.open("", "_self");
    window.close();
}

//优先使用原生js选择
function $$(selector, context){
    if( document.querySelectorAll )
        return (context || document).querySelectorAll(selector);
    else
        return jQuery(selector, context);
}
//对象转数组
function objectToArray(obj){
    var arr = [], i;
    for( i in obj )
        arr.push(obj[i]);
    return arr;
}
//数组转对象
function arrayToObject(arr){
    var obj = {},i;
    if( arr ){
        for( var i, len = arr.length; i < len; i++ ){
            obj[arr[i]] = arr[i];
        }
        return obj;
    }
}

//限制数值
function constrain(val, min, max){
    return Math.max(min, Math.min(val, max));
}


//检查浏览器支持的css属性值
function testProps(propsArray){
    for(var i = 0, len = propsArray.length; i < len; i++){
        if( document.body.style[propsArray[i]] !== undefined )
            return true;
    }
    return false;
}

//转换浏览器前缀 -webkit-
function testPrefix(){
    var prefix = ['Webkit','Moz','O','ms'];
    for( var i = 0, len = prefix.length; i < len; i++ ){
        if( testProps([prefix[i] + 'Transform']) ){
            return '-' + prefix[i].toLowerCase() + '-';
        }
    }
    return '';
}

function transform(ele,x,y,z){
    var perspectiveProperty = getProps("Perspective");
    var transformProperty = getProps("Transform");
    //支持3d
    if(perspectiveProperty){
        ele.style[transformProperty] = "translate3d("+ x + "px," + y  +"px," + z + ")";
    }
    //支持2d
    else if(transformProperty){
        ele.style[transformProperty] = "translate(" + x + "px," + y + "px)";
    }
    //不支持css3
    else{
        ele.style.positoin = "absolute";
        ele.style.left = x + "px";
        ele.style.top = y + "px";
    }
}

function transition(ele,property,duration,timingFunction,delay){
    var transitionProperty = getProps("Transition");
    if(transitionProperty){
        //注意单位(firefox下一定要有单位)
        ele.style[transitionProperty] = getProps(property) +" "+ duration +"s "+ timingFunction +" "+ delay + "s";
    }else{
        alert("浏览器不支持transition");
    }
}

function haveProperty(propsArray){
    for(var i = 0, len = propsArray.length; i < len; i++){
        if(document.body.style[propsArray[i]] !== undefined)
            return true;
    }
    return false;
}

function upperFirstLetter(str){
    return str.replace(/^[a-z]/,function(){
        //console.log(arguments);
        return arguments[0].toUpperCase();
    });
}

function getProps(props){
    if(document.body.style[props.toLowerCase()] !== undefined){
        return props.toLowerCase();
    } else{
        var profixes = ['Webkit','Moz','ms'];
        for(var i = 0, len = profixes.length; i < len; i++){
            if(document.body.style[profixes[i] + upperFirstLetter(props)] !== undefined){
                return profixes[i] + upperFirstLetter(props);
            }
        }
        return false;
    }
}

function getEngine(){
    var docStyle = document.documentElement.style;
    var engine;
    if (window.opera && Object.prototype.toString.call(opera) === '[object Opera]') {
        engine = 'presto';
    } else if ('MozAppearance' in docStyle) {
        engine = 'gecko';
    } else if ('WebkitAppearance' in docStyle) {
        engine = 'webkit';
    } else if (typeof navigator.cpuClass === 'string') {
        engine = 'trident';
    }
    return vendorPrefix = {
        trident: 'ms',
        gecko: 'Moz',
        webkit: 'Webkit',
        presto: 'O'
    }[engine];
}