11.1类型比较
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/** * Type Compatibility * 类型比较. */ interface Named { name: string; } var x: Named; //判断这个y的类型是{ name: string; location: string; } var y = { name: 'Alice', location: 'Seattle' }; x = y;
var items = [1, 2, 3];
//不压迫强迫这些额外参数... items.forEach((item, index, array) => console.log(item));
// Should be OK! items.forEach((item) => console.log(item))
var k = () => ({name: 'Alice'}); var z = () => ({name: 'Alice', location: 'Seattle'});
k = z; // OK //z = k; //这k()方法缺少了location属性.所以赋给z()方法是会报错的.
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var x; //判断这个y的类型是{ name: string; location: string; } var y = { name: 'Alice', location: 'Seattle' }; x = y; var items = [1, 2, 3]; //不压迫强迫这些额外参数... items.forEach(function (item, index, array) { return console.log(item); }); // Should be OK! items.forEach(function (item) { return console.log(item); }); var k = function () { return ({ name: 'Alice' }); }; var z = function () { return ({ name: 'Alice', location: 'Seattle' }); }; k = z; // OK //z = k; //这k()方法缺少了location属性.所以赋给z()方法是会报错的.
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