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// js 代碼
new Vue({
    el: "#app",
    data: {},
    methods: {
        get: function() {
            this.$http.get("get.php", {
                "a": 1,
                "b": 2
            }).then(function(res) {
                alert(res.data);
            }, function(res) {
                alert(res.status);
            })
        }
    }
})

----------

// php代碼 （本人對PHP一無所知）
// 變量之前加上@是因?yàn)椴患拥脑挄?huì)報(bào)一個(gè) undefined index :a的錯(cuò)
<?php
$a = @$_GET['a'];
$b = @$_GET['b'];

echo $a + $b
?>

After triggering the send event get, 0 is returned. In the example, 3 is returned. I have checked the code many times and it is exactly the same. Please solve it! Thanks!