{"id":161,"date":"2021-02-26T12:31:28","date_gmt":"2021-02-26T04:31:28","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/javascript\/?p=161"},"modified":"2021-02-26T13:13:09","modified_gmt":"2021-02-26T05:13:09","slug":"js-%e8%bf%90%e7%ae%97%e7%ac%a6","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/javascript\/post-161.html","title":{"rendered":"Js \u8fd0\u7b97\u7b26: ++, &#8211; -, +, &#8211;"},"content":{"rendered":"\n<p>\u8fd9\u91cc\u4ecb\u7ecd Js \u4e2d\u7684\u8fd0\u7b97\u7b26\uff1a++\uff0c&#8211;\uff0c+\uff0c- \u51714\u4e2a\u8fd0\u7b97\u7b26<\/p>\n\n\n\n<h5>1.\u81ea\u589e\u8fd0\u7b97\u7b26\uff1a++<\/h5>\n\n\n\n<p>\u6b64\u8fd0\u7b97\u7b26\uff0c\u4e5f\u53eb\u81ea\u589e\u8fd0\u7b97\u7b26\uff0c\u80fd\u628a\u6570\u5b57\u7c7b\u578b\u7684\u503c\u589e\u52a01<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var num = 10;\nvar num2 = num++;  \/\/\u5148\u4f7f\u7528\uff0c\u518d\u81ea\u589e\uff0c\u5219num2\u7684\u503c10\nvar num3 = 10;\nvar num4 = ++num3; \/\/\u5148\u81ea\u589e\uff0c\u518d\u4f7f\u7528\uff0c\u5219num4\u7684\u503c11<\/code><\/pre>\n\n\n\n<h5>2.\u81ea\u51cf\u8fd0\u7b97\u7b26\uff1a&#8211;<\/h5>\n\n\n\n<p>\u6b64\u8fd0\u7b97\u7b26\uff0c\u4e5f\u53eb\u81ea\u51cf\u8fd0\u7b97\u7b26\uff0c\u80fd\u628a\u6570\u5b57\u7c7b\u578b\u7684\u503c\u51cf\u5c111<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var nu1 = 5;\nvar nu2 = nu1--;  \/\/\u5148\u4f7f\u7528\uff0c\u518d\u81ea\u51cf\uff0c\u5219nu2\u7684\u503c\u662f5\nvar nu3 = 5;\nvar nu4 = --nu1;  \/\/\u5148\u81ea\u51cf\uff0c\u518d\u4f7f\u7528\uff0c\u5219nu4\u7684\u503c\u662f4<\/code><\/pre>\n\n\n\n<h5>3.\u52a0\u53f7\u8fd0\u7b97\u7b26\uff1a+<\/h5>\n\n\n\n<p>\u6b64\u8fd0\u7b97\u7b26\uff0c\u4e0d\u5355\u80fd\u8fd0\u7b97\uff0c\u8fd8\u4f1a\u81ea\u52a8\u8f6c\u6362\u6570\u636e\u7c7b\u578b\u4e3a\u6570\u5b57\uff0c\u65e0\u6cd5\u8f6c\u6362\u65f6\u5f97\u5230 NaN<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var nj1 = 10;\nvar nj2 = 5;\nvar nj3 = \"abc\";\nvar nj4 = \"123\";\nvar nj5 = true;\nvar nj6 = false;\n\/\/\u5bf9\u6b64\u5206\u522b\u8fdb\u884c\u76f8\u52a0\nalert(nj1+nj2);  \/\/\u7ed3\u679c\u4e3a\uff1a15\nalert(nj1+nj3);  \/\/\u7ed3\u679c\u4e3a\uff1aNaN\nalert(nj1+nj4);  \/\/\u7ed3\u679c\u4e3a\uff1a133\nalert(nj1+nj5);  \/\/\u7ed3\u679c\u4e3a124\nalert(nj1+nj6);  \/\/\u7ed3\u679c\u4e3a123\nalert(typeof(+nj4)); \/\/\u524d\u9762\u7701\u7565\u65f6\uff0c\u5b83\u4e5f\u4f1a\u81ea\u52a8\u8f6c\u6362\u4e3a\u6570\u5b57\u7c7b\u578b<\/code><\/pre>\n\n\n\n<h5>4.\u51cf\u53f7\u8fd0\u7b97\u7b26\uff1a-<\/h5>\n\n\n\n<p>\u8fdb\u884c\u6570\u5b66\u7684 \u52a0\u6cd5\u8fd0\u7b97<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>var jj1 = 10;\nvar jj2 = 3;\ndocument.write(jj1-jj2);  \/\/\u7ed3\u679c\u4e3a7;<\/code><\/pre>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u91cc\u4ecb\u7ecd Js \u4e2d\u7684\u8fd0\u7b97\u7b26\uff1a++\uff0c&#8211;\uff0c+\uff0c- \u51714\u4e2a\u8fd0\u7b97\u7b26 1.\u81ea\u589e\u8fd0\u7b97\u7b26\uff1a++ \u6b64\u8fd0\u7b97\u7b26\uff0c\u4e5f\u53eb\u81ea&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/javascript\/post-161.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">Js \u8fd0\u7b97\u7b26: ++, &#8211; -, +, &#8211;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/161"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/comments?post=161"}],"version-history":[{"count":2,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/161\/revisions"}],"predecessor-version":[{"id":166,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/posts\/161\/revisions\/166"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/media?parent=161"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/categories?post=161"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/javascript\/wp-json\/wp\/v2\/tags?post=161"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}