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var vm = new Vue({
	el: "#app",
	data: {
	huilv:[
	[6.8540, 132.9787, 1298.7013, 1.3278],
	[6.8540, 132.9787, 1298.7013, 1.3278]
		],}

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watch: {
			first: function(newValue) {
	  this.second = newValue * this.huilv[Number(this.firstbutton - 1)][Number(this.secondbutton -1)];
					},
			second: function(newValue) {
		this.first = newValue / this.huilv[Number(this.firstbutton - 1)][Number(this.secondbutton -1)];
					}
				}