bootstrap例子使用问题

使用bootstrap自带的例子，调试是出现这样的错误： Uncaught SyntaxError: Unexpected token < jquery.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-transition.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-alert.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-modal.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-dropdown.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-scrollspy.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-tab.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-tooltip.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-popover.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-button.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-collapse.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-carousel.js:1 Uncaught SyntaxError: Unexpected token < bootstrap-typeahead.js:1

why?