Javascript Learning (2) -- [basic review] operators, expressions, and flow control statements

Well, let's simply put the following OPERATOR: operator Description Example result + + Add xy + 2x7-minus xy-2x3 * multiply xy * 2x10 except xy2x25 % evaluate the remainder (keep the integer) xy % 2x1 ++ well, let's simply say the operator, paste a table: operator Description Example result + Add x = y + 2 x = 7-minus x = y-2 x = 3 * multiply x = y * 2 x = 10/divide x = y/2 x = 2.5% evaluate the remainder (Reserved integer) x = y % 2 x = 1 + + accumulate x = + y x = 6 -- decrease x = -- y x = 4 = x = y x = 5 + = x + = y x = x + y x = 15-= x-= y x = x-y x = 5 * = x * = y x = x * y x = 50/= x /= y x = x/y x = 2% = x % = y x = x % y x = 0 OK, I guess everyone would dislike me ?? Aluminum player? Can you tell me how to cut the stool? /Div> post code description-branch: [javascript]/*** Branch */(function () {/** if (condition ){//...} if (condition ){//..} else if (condition ){//..} else {} * // experiment var d = new Date (); var time = d. getHours (); if (time> = 18) {document. write (" Good evening")} Else {document. write (time)} // Experiment 2 if (time <10) {document. write (" Good, morning")} Else if (time >=10 & time <16) {document. write (" Good, day")} Else {document. write (" Good evening");} // Experiment 3 // operator (condition )? "True": "failed" var str = ""; str = (time> 10 )? "Good, day": "good evening"; // alert (str);/*** the (n) after the switch can be an expression or a variable switch (n) {case 1: // code break; case 2: // code break; default: // code break;} */document. write ("
") TheDay = d. getDay (); switch (theDay) {case 5: document. write ("finally Friday"); break; case 6: document. write ("super zhouliu"); break; case 0: document. write ("sleepy Sunday"); break; default: document. write ("xiwang A zhoum") ;}}) () Post code to talk about "loop" [javascript]/*** loop */(function () {/** for (variable = start value; variable <= end value; variable = variable + step) {} */var arr = [,]; for (var I = 0; I <arr. length; I ++) {document. write (arr [I] +"
")}/** While (variable <= end value) {} */var I = arr. length-1; while (I> = 0) {document. write (I + "-->" + arr [I] +"
"); I --;}/*** for (variable in object) {*} */var o = {name:" USPCAT ", age: 1 }; for (k in o) {document. write (k + "-->" + o [k] +"
") ;}}) () Post code to talk about other scattered knowledge: [javascript]/*** other scattered knowledge of js */(function () {// 1 exception capture // try {//} catch (e) {//} try {// alert (2/0)} catch (e) {// throw new Error (e)}) ()/*** timer * setTimeout * execute a code segment in a future */function timedMsg () {// function var t = setTimeout ("alert ('1 miao zhong ')", 1000);} var c = 0; var t; function timedCount () {document. getElementById ("txt "). value = c; c = c + 1; t = setTimeout ("timedCount ()", 1000)} function stop () {clearTimeout (t );}