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JS4Scratch Reference Manual:

Say For Seconds

Syntax:

sprite.sayWait('text',sec)

Example:

//Example: Say 'Hello' for 2 seconds then 'bye' for 2 seconds
spriteA.whenFlag(function(){
    this.show()
    this.sayWait('Hello',2)
    this.sayWait('Bye',2)
})
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Say

Syntax:

sprite.say('text')

Example:

//Example: Say 'Hello'
spriteA.whenFlag(function(){
    this.show()
    this.say('Hello')
})
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Think For Seconds

Syntax:

sprite.thinkWait('text',sec)

Example:

//Example: think 'Hello' for 2s then 'bye' for 2s
spriteA.whenFlag(function () {
    this.show()
    this.thinkWait('Hello',2)
    this.thinkWait('Bye',2)
})
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Think

Syntax:

sprite.think('text')

Example:

spriteA.whenFlag(function () {
    this.show()
    this.think('Hello')
})
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Switch Costume

Syntax:

sprite.switchCostumeToNum(number)

Example:

// Example: switchCostumeToNum(number)
spriteA.whenFlag(function () {
    this.show()
    this.switchCostumeToNum(0)
    this.wait(1)
    this.switchCostumeToNum(1)
    this.wait(1)
    this.switchCostumeToNum(2)
    this.wait(1)
    this.switchCostumeToNum(3)
})
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Next Costume

Syntax:

sprite.nextCostume()

Example:

// Example: cycle between all the costumes
spriteA.whenFlag(function () {
    this.show()
    while(true){
        this.nextCostume()
        this.wait(0.25)
    }
})
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Switch Backdrop

Syntax:

stage.switchBackdropTo(backdrop)

Example:

stage.whenFlag(function () {
    this.switchBackdropTo(backdropA)
    this.wait(1)
    this.switchBackdropTo(backdropB)
    this.wait(1)
    this.switchBackdropTo(backdropC)
    this.wait(1)
    this.switchBackdropTo(backdropD)
})
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Next Backdrop

Syntax:

stage.nextBackdrop()

Example:

stage.whenFlag(function () {
    while(true){
        this.nextBackdrop()
        this.wait(0.25)
    }
})
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Change size

Syntax:

sprite.changeSize(percentage)

Example:

spriteA.whenFlag(function () {
    this.show()
    this.wait(2)
    this.changeSize(200)
    this.wait(2)
    this.changeSize(-200)
})
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Set Size

Syntax:

sprite.setSize(absolute size)

Example:

spriteA.whenFlag(function () {
    this.show()
    this.wait(2)
    this.setSize(200)
    this.wait(2)
    this.setSize(50)
})
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Show

Syntax:

sprite.show()

Example:

spriteA.whenFlag(function () {
    this.show()
    this.wait(2)
    this.hide()
    spriteB.show()
    this.wait(2)
    spriteB.hide()
})
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Hide

Syntax:

sprite.hide()

Example:

spriteA.whenFlag(function () {
    this.show()
    this.wait(2)
    this.hide()
    spriteB.show()
    this.wait(2)
    spriteB.hide()
})
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GoTo Front/Back Layer

Syntax:

sendSpriteToBack(sprite)
sendSpriteToFront(sprite)

Example:

stage.whenFlag(function () {
    spriteA.show()
    spriteB.show()
    spriteC.show()
    spriteD.show()
    this.wait(2)
    this.sendSpriteToFront(spriteA)
    this.wait(2)
    this.sendSpriteToBack(spriteA)
})
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Go Forwards/Backwards a Layer

Syntax:

sendSpriteBackward(sprite)
sendSpriteForward(sprite)

Example:

stage.whenFlag(function () {
    spriteC.show()
    spriteD.show()
    this.wait(2)
    this.sendSpriteForward(spriteC)
    this.wait(2)
    this.sendSpriteBackwards(spriteC)
})
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