如何检查FormData?
console.logfor in.
var fd = new FormData(),
key;// poulate with dummy datafd.append("key1", "alskdjflasj");fd.append("key2", "alskdjflasj");
// does not do anything usefulconsole.log(fd);// does not do anything usefulfor(key in fd) {
console.log(key);}慕妹3242003
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