Javascript進階程式設計-第一階段

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//1、擷取邏輯像素var pageWidth = window.innerWidth;var pageHeight = window.innerHeight;console.log("pageWidth:" + pageWidth);console.log("pageHeight:" + pageHeight);if (typeof pageWidth != "number") {    if (document.compaMode === "CSS1Compat") {    }}//2、擷取視窗位置var leftPos = (typeof window.screenLeft == "number") ? window.screenLeft : window.screenX;var topPos = (typeof window.screenTop == "number") ? window.screenTop : window.screenY;console.log("position left:" + leftPos);console.log("position top:" + topPos);//2、 兩個比較子的卻別console.log("===:" + (null === undefined)); //trueconsole.log("==:" + (null == undefined)); // false3、 setTimeout() 應用var date1 = new Date();console.log(parseInt(date1.getTime()));var date2 = new Date();setTimeout("", 2000);console.log(parseInt(date2.getTime()));console.log(date1.getTime() - date2.getTime());4、 clearTimeout(func, time) 應用function demo() {    var date = new Date();    console.log(date);}var t = setInterval(demo, 500);setTimeout("clearInterval(t)", 3000);5、 定時器： 所有dom元素渲染完後才開始計時setTimeout("alert(‘deefe‘)", 3000);//5、閉包function createFunction() {    var result;    for (var i = 0; i < 10; i++) {        result[i] = function() {            result[i].index = i;            return i;        }    }    console.log(result[0].index);    return result;}function createFunction() {    var result = new Array();    for (var i = 0; i < 10; i++) {        result[i] = function(num) {            return function() {                result[i].index = i;                console.log(i);                return num;            };        }(i);    }    return result;}console.log(createFunction());//6、三目運算子console.log((x > y ? x : y) > z ? (x > y ? x : y) : z);//7、求最大值Math.max() 不能傳入數組， 只能傳入參數列console.log(max(12, 23, 1));function max() {    var arr = [12112, 21, 212, 12, 3213];    return Math.max(arr);}//8、回呼函數，返回上一步操作，每一次結果儲存在記憶體中，佔用記憶體function factorial1(num) {    if (num > 0) {        return num * factorial1(num - 1);    } else {        return 1;    }}//9、回呼函數，講結果返回，不佔用多餘的記憶體function factorial2(num, total) {    if (num > 0) {        return total = num * factorial2(num - 1);    } else {        return 1;    }}var n = 10;console.log("factorial1(" + n + "):" + factorial1(n));console.log("factorial2(" + n + "):" + factorial2(n));//10、函數中斷方式function say() {    console.log("1"); // 1     return 0;    console.log("2"); //函數已經結束沒有執行}中斷迴圈的方式1.break2.continue//11、ECMScript 完整的解析器alert(eval("1+2"));//12、閏年判斷var j = 1;for (var i = 1; i <= 3000; i++) {    if (getYear(i)) {        console.log(j + ":" + i);        j++;    }}function getYear(year) {    if (year % 400 == 0 || (year % 4 === 0 && year % 100 != 0)) {        return 1;    } else {        return 0;    }}//13、push(),pop(),shift(),unshift()區別var arr = [1, 2, 3];arr.push(4);console.log("push(4):" + arr); //1,2,3,4 從尾部添加var arr = [1, 2, 3];arr.pop(4);console.log(arr); //1,2  從尾部出棧var arr = [1, 2, 3];arr.unshift(4)console.log(arr); //4,1,2,3 從頭部添加var arr = [1, 2, 3];arr.shift(4);console.log(arr); // 2,3  從尾部添加//14、++在前面和在後面的區別var n = 100;alert(++n); // 101var m = 100;alert(m++); //100//15、條件操作符console.log(12 > 4 ? "yes" : "no");


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Javascript進階程式設計-第一階段