012_call和apply区别

一、

function fn(a,b) {
	console.log(this);
}
fn.call(null,1,2);           //call为参数方式
fn.apply(null,[1,2]);     //apply为数组方式

/*输出=>
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  DTRACE_NET_STREAM_END: [Function],
  DTRACE_HTTP_SERVER_REQUEST: [Function],
  DTRACE_HTTP_SERVER_RESPONSE: [Function],
  DTRACE_HTTP_CLIENT_REQUEST: [Function],
  DTRACE_HTTP_CLIENT_RESPONSE: [Function],
  global: [Circular],
  process:
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        ares: '1.14.0',
        modules: '64',
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        icu: '61.1',
        unicode: '10.0',
        cldr: '33.0',
        tz: '2018c' },
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        'NativeModule internal/url',
        'NativeModule internal/querystring',
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        'NativeModule internal/process/promises',
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        'NativeModule internal/modules/cjs/loader',
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        'NativeModule internal/modules/cjs/helpers',
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        'Binding tty_wrap',
        'NativeModule net',
        'NativeModule internal/net',
        'Binding cares_wrap',
        'Binding stream_wrap',
        'Binding tcp_wrap',
        'Binding pipe_wrap',
        'NativeModule internal/stream_base_commons' ],
     binding: [Function: binding],
     _linkedBinding: [Function: _linkedBinding],
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     assert: [Function: deprecated],
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     mainModule:
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        filename:
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     allocUnsafeSlow: [Function: allocUnsafeSlow],
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     isEncoding: [Function: isEncoding],
     concat: [Function: concat],
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     [Symbol(kIsEncodingSymbol)]: [Function: isEncoding] },
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  clearInterval: [Function: clearInterval],
  clearTimeout: [Function: clearTimeout],
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  setInterval: [Function: setInterval],
  setTimeout:
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  DTRACE_NET_STREAM_END: [Function],
  DTRACE_HTTP_SERVER_REQUEST: [Function],
  DTRACE_HTTP_SERVER_RESPONSE: [Function],
  DTRACE_HTTP_CLIENT_REQUEST: [Function],
  DTRACE_HTTP_CLIENT_RESPONSE: [Function],
  global: [Circular],
  process:
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     version: 'v10.3.0',
     versions:
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        node: '10.3.0',
        v8: '6.6.346.32-node.9',
        uv: '1.20.3',
        zlib: '1.2.11',
        ares: '1.14.0',
        modules: '64',
        nghttp2: '1.29.0',
        napi: '3',
        openssl: '1.1.0h',
        icu: '61.1',
        unicode: '10.0',
        cldr: '33.0',
        tz: '2018c' },
     arch: 'x64',
     platform: 'darwin',
     release:
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        sourceUrl:
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        headersUrl:
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        'NativeModule internal/fs/utils',
        'NativeModule internal/url',
        'NativeModule internal/querystring',
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        'NativeModule internal/process/stdio',
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        'Binding trace_events',
        'NativeModule internal/inspector_async_hook',
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        'NativeModule internal/modules/cjs/loader',
        'NativeModule vm',
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        'NativeModule console',
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     exit: [Function],
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        children: [],
        paths: [Array] } },
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     from: [Function: from],
     of: [Function: of],
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*/

　　

转载于:https://www.cnblogs.com/arun-python/p/9251092.html