原因是

data: function () {
        message: "Hello World!",
        count: 0,
        tasks: [
            "go to movie1",
            "go to movie2",
            "go to movie3",
        ],
        tasks2: [
            {body: "go to movieA", completed: false},
            {body: "go to movieB", completed: true},
            {body: "go to movieC", completed: false},
        ],
        points: 300,
},
改成 

data: function () {
    return {
        message: "Hello World!",
        count: 0,
        tasks: [
            "go to movie1",
            "go to movie2",
            "go to movie3",
        ],
        tasks2: [
            {body: "go to movieA", completed: false},
            {body: "go to movieB", completed: true},
            {body: "go to movieC", completed: false},
        ],
        points: 300,
    }
},

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