https://pro-api.coinmarketcap.com/v1
在前端中有一个显示币价的功能，那么就要实时查询到这个币价。因为平时也是用coinmarketcap查看行情的，所以，第一时间也是想到用它来实现这个功能。
https://coinmarketcap.com/api/documentation/v1/#section/Standards-and-Conventions
先找来它的开发文档，注册帐号，获得API KEY，然后是测试查询！
this.axios.request({
method:"get",
url:'https://pro-api.coinmarketcap.com/v1/global-metrics/quotes/latest',
headers: {
'X-CMC_PRO_API_KEY': 'd8002bdd-7a6d-4a2b-xxxxx,
"Accept": "application/json",
"Access-Control-Allow-Origin":"*",
"Content-Type":"application/json",
"Accept-Encoding": "gzip",
},
params: {
'CMC_PRO_API_KEY': 'd8002bdd-7a6d-4a2b-xxxxx',
}
}).then( (arg) => {
console.log(111,arg.data)
}).catch( (error) => {
console.log(333,error)
})
按照文档写了函数，但测试起来总是有个跨域的问题存在，如上图所示！
以前做前端的时候也碰到过跨域的问题，调下参数一般都能解决！但这次的问题很怪：直接用postman都可以访问到数据，但用前端就是一直报错！ 查了无数文档，看了数个视频，自信对跨域的问题是有了一定的了解，但是测试起来问题总是存在！
无奈下，只能求助于其它的API工具了，希望它能给我受伤的小心灵一点安慰吧！
async testApi(){
let res = await this.axios.request({
method:"get",
url:'https://api.coingecko.com/api/v3/coins/bitcoin',
headers: {
"accept": "application/json",
}
})
console.log(111,res)
}
这次换了coingecko的API，想不到一次就成功了，而且不用注册，也不用什么API KEY之类的，简短两行代码就搞定了，真是幸福感满满啊！
有时候还真不能钻牛角尖，特别是死牛角！换个思路可能会是更好的办法！
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