Getting started with JavaScript: 005-Basic JS statements

Getting started with JavaScript: 005-Basic JS statements
The basic statements of JS are as follows. Let's take a look at the loop statements and selection statements.
Loop statement
1. for Loop

For (var I = 1; I <100; I ++) {// code}

2. do... while loop

Var I = 0; do {I ++; // code} while (I <100 );

3. Traverse

Var array = new Array (); array [0] = "you know"; array [1] = "over"; array [2] = "Haha "; array [3] = "Tigger"; for (var item in array) {document. write (item );}

Since it is a loop, the break and continue are naturally the same.

    for (var i = 1; i < 100; i++) {        if (i == 99) {            break;        }        if (i % 2 == 0) {            continue;        }        alert(i.toString());    }

Select statement
1. if... else
This is too simple.
2. switch
It is used in the same way as other languages.

    var flag = "";    switch (flag) {        case 1:            break;        case 2:            break;        default:            alert(flag);            break;    }

These statements are basically the same as the programming languages we usually use. The definitions, declarations, and assignments of variables are the same.