JS函数调用原理($.ajax原理)

参考四种函数调用:http://www.cnblogs.com/qlqwjy/p/7660013.html

　　　　　　　　http://www.cnblogs.com/qlqwjy/p/7660375.html

1.首先理解自调函数:(有名自调与匿名自调)

　　两个圆括号，第二个括号传递参数即可自调。

<script type="text/javascript">
    (function test(para){
        alert("test函数"+para)
    })('1');

    (function(para){
        alert("匿名函数"+para)
    })('2');
</script>

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2.有名字函数的调用:

　　alert(test)是打印test函数的语句，test相当于一个变量，值为整个声明函数的语句。test(1)可以理解为(test)(1)，也就是先用括号将test变量包起来然后加个(1)形成函数调用形式

function test(para){
    alert("test函数"+para);
}
alert(test);
test(1);

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aaarticlea/png;base64,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" alt="" />

3.匿名函数的调用:

　　alert(fun)是打印匿名函数的语句，fun相当于一个变量，值为整个声明函数的语句。fun(2)可以理解为(fun)(2)，也就是先用括号将fun变量包起来然后加个(2)形成函数调用形式.

var fun = function(para){
    alert("匿名函数"+para)
}
alert(fun);
fun(2);

aaarticlea/png;base64,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" alt="" />

aaarticlea/png;base64,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" alt="" />

4.匿名函数也可以带函数名字:

var fun = function test3(para){
    alert("匿名函数"+para)
}
alert(fun);
fun(2);

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAbMAAACZCAIAAAAqz0M0AAAL0ElEQVR4nO3dT28bxxnHcb6aAE5fQZEe/Ar2Yli1WeRkBz0UBVoByTvYmyqBIAKhFwE29g3k1lwc210kSIAWCWQZPgZa6iAJcgGTkiyPmelhl7szz8ws/y0pivp+IKAW9/8W+uWZnZ1hSwEAbK3rPgEAWDkkIwBIJCMASCQjAEgkIwBIJCMASCQjAEgkI4BbodPpdLvdfr+f/9rv97vdbqfT8a5MMgK4Fbrd7ubm5vb2dr/f7/f729vbm5ub3W7XuzLJCOBW6Pf7Ozs7eTjmsZinpHdlkhHAbVGGY30sKpIRwO1RNqJJRgBQyojF7e3tsllNaxrArSZ6YPJwbL4HJo1brSjJZt5+kv0u6hg3QZZErXpxOvm65trArbSkt3bWMBnNgDEOm8aheDE2CJ1mvoq5nbG7uovLkqgmzeqXApjPbUrG+r0FlmZJVCZQGlshl8bl+lkS+fddxGC5kZVowa3KhVSBwLUgGatl45MmS6LQHrw7SONWK45rdl1zStSMwPVpLhnNRqLzR1strDapabuKZPRtLfdgLzKW5KdinV2+rlGx1SRe7TWLA9pXPfqoLnQbSEb7yqavMmsLV+CWaiYZxV+X/Wsam7mVJUma/29crm+1UmUyVos8uzWbttWvVt6kibmFEQHG7vLwMjLGmxSe9PPdDLlyTTLWVbFztaYnjXpFMgI+jSRjXS7UxIm9uq8F7atLqypP7LZcGDpkMIeKEAqEbhVR3tayN0nlRfhuQL5x8NZM3ZrOksh67lneKGIPmFYTyegrUMqlYyomtwSaLBk9uxVp7OZVfTJaS/yr2tWvswertrWrWX+f9hRVXZza/3Klsajai9+mKB8BFK4rGe2CycySBpKx+tUpBf0Z4ewttOokDerggz/jAsemoiwA3WS0klBegfV/CdkITGuBrelgs9fdIvSQcOrWdO2B6vtPnJox1F0xTee0s2Dyp3p2CSySUZyHc2yxnGwEprO4HpjAW4B5D4y1ht3PMlkyentgyvaj3bljnaUoKr1HskM/sIX9AE+cjbxRvuJ4vCIInWQUQRion53O+ppedWITsCzmrR1f21osst6rmb41LfcRHGbilILlhzISAhsFDzLpaBYzuLwt7XGxNOY5oxXexiZit6GuGJIRcDGjxAqaZBi0N1XN4OU9cGB2JCMASCQjAEgkIwBIJCMASCQjAEgkIwBIJCMASCQjAEgkIwBIJCMASCQjAEgkIwBIJCMASCQjAEgkIwBIJCMASCQjAEgkIwBIJCMASPMkY/F1Jc1+4Ujdl80DwFLMkYz2V8E3ZRWSsfyGKuf7pxq+YGeP4a/EBrBEsydj6Fs6Z9Bw5Ey/O2uLNC6/tzqyPl5EYjvfWn3d/1UAoEjG2i2M+rXBq3WPPUrDxR0EwFRmTEbji43j1G4Bl7/k/yjXNIqhauso+Y/x3cpRkrn7kt+fnMatKEn97V17i2KZebRMrBQlmWcLeSVK5pd5XcY21n7LVZMkKk+/OhfzGo3zIhmBVdBIzRhOxlECGA1Tz6M0s2Sr9mU1Zqtf0tgOPbf5KXYnd+15kilqxlF+VWvJ3VhBXZ5vLO9HlkQtq0FuxXtW/rv4eDFPbgFMbcHJ6H7q++v3JqMMsNFK4pmgJ0uMD82C0CpLWzIKfZFUpZ75AFCcmFXoifrUDWHjhEQbehW6ngDkbkEyBuImD7Ey+LzFmnkynqpWnldLFn/uowGzme001KkZgRXRTA+M0aqtAsKfjFYLOE1GDeSpWtOTJ6O9k7w1myWJbNPajVvPZZnXYjWRy/0bB6pWsG6B9yYtqZsHwFQa6puuGolxUl8z2isbD+t8PTBGR48ZV2OS0dydtRNxOHun1e9ul41bISfONZh7TXw1o/cm0TcNrCJGB06qTLBGHwjyPiOwikjGyRUFaoPJyBgYYDWRjFOjExlYeyQjAEgkIwBIJCMASNeUjAt5VucMeBGmmFMstCvjPcm4eC0nf0UyilO6loG1cSOT0RxQY7waWOSTUtbr2sanFeNFyWB0yiOKIdpZEsVplkRxMnrxxj2SfX5LQf8Q0ICbkIzhgcppnM96YyRjuHA0R6g4BxfD/6IkMcdMl+P/4qQsEsXejdl3qqPZ57cslK7AvG5eMpp/90XyVJln1IxRNRTHHoZSZJb9grVZLpYpmY/nS+NWHrhGu7nYLoljcyBgNejGHN9iHcq5hEVgLA0wp+Uko3/iQmewoDWUuJjW8J+xWZfV/tUXTdvgc0Y7jYphzJ6JzKz6McusHCuTMb+CLIny6EuTOI4jZ/YJPzcZ7UknvSMKQ1M+Omt4DwBgGstIxsDEhe78XuYUNfaYZVEmho5j1Izjh5L4m9WqirZiNp44bsXxaGKesq/FfLRYdsfETjnq5U1GzywVE0z56FlDUTQC81pWazo0caHTFTJ6imc/WJzobz4LPQOUAejvfxFPIltWk3h07FFh6D2XcY8V3TMzHpiK+SI9s2oEpnz0zYBB0QjMZQnJWDtxobe4q0nGcTVjHLeiJBMrWQ/+Wq1WFPni1XxeaU+6Y59L8X5OMFPHV2uB1nS52eiCx0756F1DUTMC81p8Mo6ZuNB8zjdqGo5JxrrnjGYABmtGf3C4yVhzDHsaSWt6sxmT0f0ChfFTPnrXUEyBC8xrGa3pMRMXul0IssVoNW/DRaP3zcXAipO0pgN8s0cWXTnFk8hxsRSoGZPQtJHhKR99a1AyAnO7gaMDg3/348bAjHlYOb7nRNmtafu9H5FX00VTo0UeDxmBed3AZFzHcR7NJeP63RvgGtzIZFw/PBgEVgrJCAASyQgAEskIABLJCADSjMmYJZF3yDEArIHZa0bemgOwrmZPRgZaAFhXJCMASHMlI81pAGtprr5pRm4AWEvUjAAg8ZwRACSSEQAk3mcEAIkxMAAgMW4aACSSEQAkkhEAJJIRACSSEQAkkhEAJJIRACSSEQAkkhEAJJIRACSSEQAkkhEAJJIRACSSEQAkkhEAJJIRACSSEYBSSn3389u7X+3/7s//XY+fu1/tf/fz25nvBskIQCml7n75y0bn4vGeXo+fjc7F3S9/mflukIwAlFLq0y9+fLyn27tr8vN4T3/6xY8z3w2SEYBSSt159MOaJeOdRz/MfDdIRgBKkYw2khGAUiSjjWQEoBTJaCMZAShFMtpIRgBKKXXn0fdrl4zfz3w3SEYASi0sGQ/ea/1ePw2tkOqBrl2BZARwjRpJxqdHujQ40k+PftPa+qS9q9tvdL2jNyQjgNXQSDI+7JzuHQ61Vs+2Tu4fDLXWvf2Te1sne4dDrYevXly0d3X79cfyc/mzr7TWvdckI4DV0FRr+uC91mfvH+zqI189ODjS7e7Zva2Tja5v85pFJCOA5WsmGdOPgyIDf3u1fzXQw1fPTvYOh/ryam/rsqf1ILt66o1Mt9FNMgK4do0k44u3WmvdO7wa6OHBazVwUy+7etg5NVvQz8503vouP7nfuSAZAayERpLx+dlQa93L1CgZPTVjvubRqDZ8fqa1/vh87igkGQE0r5FkfLBz2bOS0VMztnd1+81HrXXv4GKUjJYXJCOAFdFQD8yHXpFvw4Pex7yZ7NaMeaN70CtrRrM1ffaAZASwIhpMxt7+yb2t0+dnWl9+eLKrn2RDfame7H4okjHVA60Hl8P81UVa0wBWV0PJ+G5j9NrNk0wNDi8e5sk4KiRfvbh48Vbrs8v7/zi99+zKbW5rrfVbkhHAamh6dODFw85Z3stsdEaf/vFr/WDn5N7Ou/aubn/9v/vuy95bo6UkI4Brx4wSJpIRgFIko41kBKAUyWgjGQEoRTLaSEYASpGMNpIRgFIko41kBKCUUn/4+08bO+8e7+n1+NnYeffZ336a+W6QjACUUuqbl7/+/i8vP/n820/+9K8b//P5t5/99d/fvPx15rtBMgJQSqnz8/Pj4+OjdXF8fHx+fj7z3SAZAUAiGQFAIhkBQCIZAUAiGQFAIhkBQCIZAUAiGQFAIhkBQCIZAUAiGQFAIhkBQCIZAUAiGQFAIhkBQCIZAUD6P1KthxCrFLDrAAAAAElFTkSuQmCC" alt="" />

aaarticlea/png;base64,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" alt="" />

5.直接量函数

　　只要是表达式语法，脚本宿主就认为 function 是一个直接量函数，如果什么都不加，光以 function 开头的话则认为是一个函数声明，把 function 写进一个表达式内部，比如四则运算，宿主也会将其当作是一个直接量，如下：

　　只有函数表达式可以被立即调用,函数声明不可以.

alert(10+function(para){return para;}(5))

+function (a) {
    alert(a)
}('a');

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aaarticlea/png;base64,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" alt="" />

var fun = function test3(para){
    return "3";
}();
alert(fun);

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