文字打字效果，文字逐个显示

cc.Class({
    extends: cc.Component,
    
    properties: {
    text:cc.Node,
	}

    start() {
    },
    
	setText(){
            var str = "欢迎您 " + "\n希望您在这里度过一段愉快的时光";
            var j = 0;
            this.text.getComponent(cc.Label).string = "";
            this.schedule(function () {
                this.text.getComponent(cc.Label).string += str[j];
                j++;
            }, 0.1, str.length - 1, 0.2);
	}
});