Type-Checking Variables

本文详细介绍了JavaScript中不同类型的变量如何进行类型检查。包括基本数据类型如字符串、数字、布尔值等,以及复杂类型如对象、数组和函数的具体类型判断方法。

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          Type-Checking Variables

          Variable               typeof Variable        Variable.constructor

          { an: “object” }       object                 Object

          [ “an”, “array” ]      object                 Array

          function(){}           function               Function

          “a string”             string                 String

          55                     number                 Number

          true                   boolean                Boolean

          new User()             object                 User

 

root@ubuntu:/share/valgrind-3.15/valgrind-3.15.0# ./configure --host=arm-unknown-linux-gnueabihf --prefix=/share/valgrind-3.15/valgrind-3.15.0/_install/ checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for arm-unknown-linux-gnueabihf-strip... arm-unknown-linux-gnueabihf-strip checking for a thread-safe mkdir -p... /bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking whether make supports nested variables... yes checking whether to enable maintainer-specific portions of Makefiles... no checking whether ln -s works... yes checking for arm-unknown-linux-gnueabihf-gcc... arm-unknown-linux-gnueabihf-gcc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... yes checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether arm-unknown-linux-gnueabihf-gcc accepts -g... yes checking for arm-unknown-linux-gnueabihf-gcc option to accept ISO C89... none needed checking whether arm-unknown-linux-gnueabihf-gcc understands -c and -o together... yes checking for style of include used by make... GNU checking dependency style of arm-unknown-linux-gnueabihf-gcc... gcc3 checking how to run the C preprocessor... arm-unknown-linux-gnueabihf-gcc -E checking for arm-unknown-linux-gnueabihf-g++... arm-unknown-linux-gnueabihf-g++ checking whether we are using the GNU C++ compiler... yes checking whether arm-unknown-linux-gnueabihf-g++ accepts -g... yes checking dependency style of arm-unknown-linux-gnueabihf-g++... gcc3 checking for arm-unknown-linux-gnueabihf-ranlib... arm-unknown-linux-gnueabihf-ranlib checking for gcc-ranlib... /usr/bin/gcc-ranlib checking for a sed that does not truncate output... /bin/sed checking for ar... /usr/bin/ar checking for gcc-ar... /usr/bin/gcc-ar checking for perl... /usr/bin/perl checking for gdb... /usr/bin/gdb checking dependency style of arm-unknown-linux-gnueabihf-gcc... gcc3 checking for diff -u... yes checking for arm-unknown-linux-gnueabihf-gcc option to accept ISO C99... none needed checking for a supported version of gcc... ok (12.3.0) checking build system type... x86_64-unknown-linux-gnu checking host system type... arm-unknown-linux-gnueabihf checking for a supported CPU... no (arm) configure: error: Unsupported host architecture. Sorry
04-04
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