\u81ea\u589e\u81ea\u51cf\u8fd0\u7b97<\/p>\n
var i = 1;
\nwhile(i <= 100) {
\n++i; \/\/ i += 1;
\ni++ ; \/\/ i += 1;
\ndocument.write(i + “<br \/>”);
\n}<\/p>\n
\u4e24\u79cd\u60c5\u51b5\u4f55\u6253\u5370\u591a\u5c11 ?<\/p>\n
\u601d\u8003:
\n\u5982\u679c\u6709\u5355\u72ec\u76842\u884c\u8bed\u53e5<\/p>\n
i++;
\n++i;
\n\u4ed6\u4eec\u7684\u4f5c\u7528\u6709\u4f55\u4e0d\u540c?
\n\u8fd9\u65f6\u6ca1\u6709\u4efb\u4f55\u4e0d\u540c, \u90fd\u662f\u8d77\u5230 i += 1\u7684\u6548\u679c.
\n\u903b\u8f91\u8fd0\u7b97
\n\u903b\u8f91\u8fd0\u7b97 &&, ||,
\n\u5728PHP\u4e2d,\u903b\u8f91\u8fd0\u7b97\u8fd4\u56de\u7684\u662f\u5e03\u5c14\u503c, true \/false
\n\u800c\u5728js\u4e2d,\u903b\u8f91\u8fd0\u7b97\u7a0d\u6709\u7279\u6b8a,<\/p>\n
\u8fd4\u56de\u7684\u662f\u80fd\u786e\u5b9a\u6574\u4f53\u8868\u8fbe\u5f0f\u7684\u503c\u7684\u7b2c\u4e00\u4e2a\u8868\u8fbe\u7684\u503c.<\/p>\n
<\/p>\n
\/\/ \u8fd9\u4e9b\u4e1c\u897f\u88ab\u7528\u6765\u505a\u903b\u8f91\u5224\u65ad\u7684\u65f6\u5019\u5f53\u6210\u5047
\nfalse, 0, ”, null ,undefined,
\n\u8fd9\u4e9b\u662f\u5047,\u9664\u5916\u5f53\u771f
\nvar res = 3 || null;
\nalert(res); \/\/ 3<\/p>\n
var res 0 || false;
\nalert(res); \/\/ false;<\/p>\n
var res = true && 9;
\nalert(res); \/\/ 9<\/p>\n
var res = false && true
\nalert(res); \/\/ false;
\n3\u5143\u8fd0\u7b97
\n\u8868\u8fbe\u5f0f1 ? \u8868\u8fbe\u5f0f2 : \u8868\u8fbe\u5f0f3;
\n\u8868\u8fbe1\u4e3a\u771f,\u5219\u6267\u884c\u8868\u8fbe\u5f0f2,\u5426\u5219 \u6267\u884c\u8868\u8fbe\u5f0f3<\/p>\n
if(\u8868\u8fbe\u5f0f1){
\n\u8868\u8fbe\u5f0f2;
\n} else {
\n\u8868\u8fbe\u5f0f3;
\n}<\/p>\n
<\/p>\n
\u5206\u652f\u7ed3\u6784<\/p>\n
if(\u8868\u8fbe\u5f0f) {
\n\u8bed\u53e5\u5757;
\n}
\n\u8bed\u53e5\u5757\u8981\u4e48\u4e0d\u6267\u884c, \u8981\u4e48\u6267\u884c\u4e00\u6b21
\nif(\u8868\u8fbe\u5f0f) {
\n\u8bed\u53e5\u57571;
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\n}<\/p>\n
\u8bed\u53e5\u57571\u548c\u8bed\u53e5\u57572\u5fc5\u6709\u4e00\u6bb5\u88ab\u6267\u884c.
\nif(\u8868\u8fbe\u5f0f1) {
\n} else if(\u8868\u8fbe\u5f0f2) {
\n} …. else {
\n}<\/p>\n
<\/p>\n
while\u5faa\u73af
\nwhile(\u8868\u8fbe\u5f0f) {
\n\u8bed\u53e5\u5757;
\n}
\n\u8bed\u53e5\u5757\u6709\u53ef\u80fd\u6267\u884c?\u6b21
\n0\u6b21,
\nN\u6b21,
\n\u6216\u65e0\u9650\u5faa\u73af.<\/p>\n
while(true) {
\n\/\/\/ \u65e0\u9650\u5faa\u73af;
\n}<\/p>\n","protected":false},"excerpt":{"rendered":"
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