Node.js+MongoDB+AnglarJS-2 Javascript基礎

var myData ;
var myString = 'Some Text' ;
var newString = myString + ' some More Text' ;

var myString = 'Some Text' ;
var anotherString = 'Some More Text' ;

var myInteger = 1 ;
var cost = 1.33 ;

var arr = { 'one', 'two', 'three' } ;
var first = arr[ 0 ] ;

var obj = { 'name': 'Brad', 'occupation': 'Hacker', 'age': 'Unknow' } ;
var name = obj.name ;

var newVar = null ;

if( x == 5 ) {
    do_something() ;
}

if( x == 5 ) {
    do_something() ;
} else {
    do_something_else() ;
}

if( x < 5 ) {
    do_something() ;
} else if( x < 10 ) {
    do_something_else() ;
} else {
    do_nothing() ;
}

switch(     ) {
case value1: 
    <      > break ; case value2: <      > break ; default: <    value1   value2      > }

var i = 1 ;
while( i < 5 ) {
    console.log( 'Iteration ' + i ) ;
    i++ ;
}

var i = 0;
do {
    console.log( 'Iteration ' + i ) ;
    i++ ;
} while( i <  5 ) ;

for(   ；   ；    ) {
    <      > }

var days = [ 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday' ] ;
for( var idx in days ) {
    console.log( 'It's ' + days[ idx ] + '<br>' ) ; }

var days = [ 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday' ] ;
for( var idx in days ) {
    if( days[ idx ] == 'Wednesday' ) break ;
    console.log( 'It's ' + days[ idx ] + '<br>' ) ; }

var days = [ 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday' ] ;
for( var idx in days ) {
    if( days[ idx ] == 'Wednesday' ) continue ;
    console.log( 'It's ' + days[ idx ] + '<br>' ) ; }

function myFunction() {
    console.log( 'Hello World' ) ;
}

myFunction() ;

function greeting( name, city ) {
    console.log( 'Hello ' + name ) ;
    console.log( '. How is the weather in ' + city ) ;
}

var name = 'Brad' ;

greeting( name, 'Florence' ) ;

function formatGreeting( name, city ) {
    var retStr = '' ;
    retStr += 'Hello <b>' + name + '/n' ;
    retStr += 'Welcome to ' + city + '!' ;
    return retStr ;
}

var greeting = formatGreeting( 'Brad', 'Rome' ) ;
console.log( greeting ) ;

console.log( doCalc( 5, 10, function( n1, n2 ) {
    return n1 + n2 ;
} ) ) ;

var myVar = 1 ;
function writeIt() {
    var myVar = 2; 
    console.log( 'Variable = ' + myVar ) ;
    writeMore() ;
}
function writeMore() {
    console.log( 'Variable = ' + myVar ) ;
}
writeIt() ;

var x = new Number( '5' ) ;

var s = myObj.name ;
myObj.name = 'new Name' ;

var name = myObj.getName() ;
myObj.getName = function() {
    return this.name ;
}

var obj = {
    name: 'My Object',
    value: 7,
    getValue: function() {
        return this.value;
    }
}

var propName = 'User Name' ;
var val1 = myObj[ propName ] ;
var val2 = myObj[ 'Other Name' ] ;

var user = new Object() ;
user.first = 'Brad' ;
user.last = 'DayLey' ;
getName = function() {
    return this.first + ' ' + this.last ;
}

var user = {
    first: 'Brad',
    last: 'Dayley',
    getName: function() {
        return this.first + ' ' + this.last ;
    }
}

function User( first, last ) {
    this.first = first ;
    this.last = last ;
    this.getName = function() {
        return this.first + ' ' + this.last ;
    }
}

var user = new User( 'Brad', 'Dayley' ) ;

function UserP( first, last ) {
    this.first = first ;
    this.last = last ;
}
UserP.prototype = {
    getFullName: function() {
        return this.first + ' ' + this.last ;
    }
}

var word1 = 'Today ' ;
var word2 = 'is ' ;
var word3 = 'tomorrows\' ' ;
var word4 = 'yesterday.' ;
var sentence1 = word1 + word2 + word3 + word4 ;
var sentence2 = word1.concat( word2, word3, word4 ) ;

var myStr = 'I think, therefore I am.' ;
if( myStr.indexOf( 'think' ) != -1 ) {
    console.log( myStr ) ;
}

var username = 'Brad' ;
var output = '<username> place enter your password: ' ;
output.replace( '<username>', username ) ;

var t = '12:10:36' ;
var tArr = t.split( ':' ) ;
var hour = tarr[ 0 ] ;
var minute = tArr[ 1 ] ;
var sencond = tArr[ 2 ] ;

var arr1 = [ 1, 2, 3 ] ;
var arr2 = [ 'three', 'four', 'five' ] ;
var arr3 = arr1 + arr2 ;
var arr4 = arr1.concat( arr2 ) ;

var week = [ 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday' ] ;
for( var i = 0; i < week.length, i++ ) {
    console.log( '<li>' + week[ i ] + '</li>' ) ;
}
for( dayIndex in week ) {
    console.log( '<li>' + week[ dayIndex ] + '</li>' ) ;
}

var timeArr = [ 12, 10, 36 ] ;
var timeStr = timeArr.join( ':' ) ;

function message( day ) {
    var week = [ 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday' ] ;
    if( week.indexOf( day ) != -1 ) {
        console.log( 'Happy ' + day ) ;
    }
}

try{
    var x = badVarName ;
} catch( err ) {
    console.log( err.name + ': "' + err.message + ' " occurred when assigning x.' ) ;
}

function sqrRoot( x ) {
    try {
        if( x == '' ) throw { message: "can't Square Root Nothing" } ;
        if( isNaN(x) ) throw { message: "can't Square Root Strings" } ;
        if( x < 0 ) throw { message: "Sorry No Imagination" } ;
        return "sqrt( " + x + " )" + Math.sqrt( x ) ;
    } catch ( err ) {
        return err.message ;
    }
}

function testTryCatch( value ) {
    try {
        if( value < 0 ) {
            throw 'too small' ;
        } else if( value > 10 ) {
            throw 'too big' ;
        } 
        your code here ;
    } catch ( err ) {
        console.log( 'The number was ' + err ) ;
    } finally {
        console.log( 'This is always written' ) ;
    }
}